From 5f4e5cd9dd3757c48d384d49952dbf1f6816bb59 Mon Sep 17 00:00:00 2001
From: Miguel Campos <amodestduck@gmail.com>
Date: Thu, 10 Jan 2019 01:03:58 -0800
Subject: [PATCH] standardize filenames in e2e (#7471)

* standardizing file names to fit facebook standards

* updating filenames to better fit facebook standards

* standardizing jest-runner filenames to fit facebook standards

* standardizing file names in /e2e/before-all-filtered

* resolving naming discrepencies inside of files

* standardizing filenames in e2e/before-each-queue and corresponding tests

* standardizing several tests in ./e2e/__test__/

* standardizing filenames for babel-plugin-jest-hoist and related test files

* standardizing file-names for folders 'browser-support' and 'clear-cache' and their corresponding test files

* resolving issue with karma referencing non-standard browserTest

* resolving issue with karma referencing non-standard browserTest filename

* standardizing file names to fit facebook standards

* updating filenames to better fit facebook standards

* Add issue template labels (#7470)

* Add issue template labels

* Lint

* standardizing jest-runner filenames to fit facebook standards

* allow `bail` setting to control when to bail out of a failing test run (#7335)

* standardizing file names in /e2e/before-all-filtered

* resolving naming discrepencies inside of files

* standardizing filenames in e2e/before-each-queue and corresponding tests

* standardizing several tests in ./e2e/__test__/

* standardizing filenames for babel-plugin-jest-hoist and related test files

* standardizing file-names for folders 'browser-support' and 'clear-cache' and their corresponding test files

* resolving issue with karma referencing non-standard browserTest

* resolving issue with karma referencing non-standard browserTest filename

* standardizing file names in e2e/__test__

* standardizing file names in compare-dom-nodes

* standardizing file names for coverage-report and coverage-remap

* updating case sensitive filenames

* renaming files to fit facebook standards

* adding case sensitive file changes

* resolving dependency issues after renaming case sensitive files.

* standardizing file names to fit facebook standards

* adjusting file names and snapshots to fit facebook standards

* adjusting file names to fit facebook standards

* resolves bug with nodeAssertionError not being found by test suite

* changing references to match file name

* changing file name to check test-jest-circus

* readding a previously deleted snapshot

* Update e2e/bad-source-map/__tests__/badSourceMap.js comment to reflect new file name

Co-Authored-By: GGonryun <amodestduck@gmail.com>

* improving file naming conventions letters g & j

* changing filename to fit facebook standards

* renaming filenames to fit facebook standards for 'L'

* renaming filenames to fit facebook standards for 'M'

* renaming filenames to fit facebook standards for 'N'

* resolving leftover merge conflicts

* reverting error in naming by changing filename back to uppercase

* renaming filenames 'O' to fit facebook standards.

* renaming filenames 'P' to fit facebook standards.

* renaming filenames 'R' to fit facebook standards.

* renaming filenames 'S' to fit facebook standards.

* changing regex to match temporary folder name

* renaming filenames 'T' to fit facebook standards.

* renaming filenames 'U' to fit facebook standards.

* renaming filenames 'V' to fit facebook standards.

* renaming filenames 'W' to fit facebook standards.

* updating snapshots to reflect standardized file names

* Rename e2e/test-name-pattern-skipped/package.json to e2e/test-name-pattern-temp/package.json

* Rename e2e/test-name-pattern/package.json to e2e/test-name-pattern-skipped/package.json

* Rename e2e/test-name-pattern-skipped/package.json to e2e/test-name-pattern.package.json

* Rename e2e/test-name-pattern-temp/package.json to e2e/test-name-pattern/package.json

* Rename e2e/test-name-pattern.package.json to e2e/test-name-pattern-skipped/package.json

* removing left over files and adjusting file names previously missed

* deleting more leftover files
---
 CHANGELOG.md                                  |   2 +-
 .../__snapshots__/before-all-filtered.js.snap |  19 ---
 .../__snapshots__/before-each-queue.js.snap   |  19 ---
 .../__snapshots__/beforeAllFiltered.js.snap   |  19 +++
 .../__snapshots__/beforeEachQueue.js.snap     |  19 +++
 ... => cliHandlesExactFilenames.test.js.snap} |   0
 ...onsoleLogOutputWhenRunInBand.test.js.snap} |   0
 ...js.snap => coverageRemapping.test.js.snap} |   0
 ...st.js.snap => coverageReport.test.js.snap} |  48 ++++----
 ...js.snap => coverageThreshold.test.js.snap} |   0
 ...overageTransformInstrumented.test.js.snap} |   0
 ...p => customMatcherStackTrace.test.js.snap} |  14 +--
 ...t.js.snap => customReporters.test.js.snap} |   0
 ...dles.js.snap => detectOpenHandles.js.snap} |   0
 e2e/__tests__/__snapshots__/each.test.js.snap |  12 +-
 ...ap => emptyDescribeWithHooks.test.js.snap} |  38 +++---
 ...js.snap => errorOnDeprecated.test.js.snap} |  12 +-
 ....js.snap => executeTestsOnceInMpr.js.snap} |   0
 ...s.snap => expectAsyncMatcher.test.js.snap} |   0
 .../__snapshots__/failures.test.js.snap       |  98 ++++++++--------
 ....js.snap => findRelatedFiles.test.js.snap} |   0
 .../__snapshots__/globals.test.js.snap        |  24 ++--
 ....js.snap => jestChangedFiles.test.js.snap} |   0
 ...ts.test.js.snap => listTests.test.js.snap} |   0
 ....js.snap => moduleNameMapper.test.js.snap} |   0
 ...s.snap => multiProjectRunner.test.js.snap} |   0
 ....test.js.snap => processExit.test.js.snap} |   0
 ...snap => requireAfterTeardown.test.js.snap} |   0
 ...p => resolveNoFileExtensions.test.js.snap} |   0
 ...g.test.js.snap => showConfig.test.js.snap} |   0
 .../__snapshots__/snapshot.test.js.snap       |   8 +-
 ...st.js.snap => snapshotMockFs.test.js.snap} |   0
 ....snap => snapshotSerializers.test.js.snap} |   0
 ...e.test.js.snap => stackTrace.test.js.snap} |  14 +--
 ...t.js.snap => testNamePattern.test.js.snap} |   0
 ...ap => testNamePatternSkipped.test.js.snap} |   0
 ...odo.test.js.snap => testTodo.test.js.snap} |  12 +-
 ...st.js.snap => timeoutsLegacy.test.js.snap} |   0
 ...nap => toMatchInlineSnapshot.test.js.snap} |   0
 ...wErrorMatchingInlineSnapshot.test.js.snap} |   0
 ...toThrowErrorMatchingSnapshot.test.js.snap} |   0
 .../__snapshots__/transform.test.js.snap      |   4 +-
 ...s.snap => typescriptCoverage.test.js.snap} |   0
 ....snap => watchModeOnlyFailed.test.js.snap} |   0
 ...js.snap => watchModePatterns.test.js.snap} |   0
 ...p => watchModeUpdateSnapshot.test.js.snap} |   0
 ...r_mocks.test.js => autoClearMocks.test.js} |   0
 ...t_mocks.test.js => autoResetMocks.test.js} |   0
 ...mocks.test.js => autoRestoreMocks.test.js} |   0
 ...t.test.js => babelPluginJestHoist.test.js} |   0
 ...ource_map.test.js => badSourceMap.test.js} |   0
 ...e-all-filtered.js => beforeAllFiltered.js} |   0
 ...efore-each-queue.js => beforeEachQueue.js} |   0
 ...clear_cache.test.js => clearCache.test.js} |   0
 ...st.js => cliHandlesExactFilenames.test.js} |   0
 ..._nodes.test.js => compareDomNodes.test.js} |   2 +-
 ... => consoleLogOutputWhenRunInBand.test.js} |   2 +-
 ...ping.test.js => coverageRemapping.test.js} |   0
 ..._report.test.js => coverageReport.test.js} |  12 +-
 ...hold.test.js => coverageThreshold.test.js} |   0
 ... => coverageTransformInstrumented.test.js} |   0
 ...est.js => customMatcherStackTrace.test.js} |   0
 ...orters.test.js => customReporters.test.js} |   2 +-
 ...esolver.test.js => customResolver.test.js} |   0
 ..._clash.test.js => dependencyClash.test.js} |   0
 ...s.test.js => deprecatedCliOptions.test.js} |   0
 ...t_open_handles.js => detectOpenHandles.js} |   0
 e2e/__tests__/each.test.js                    |   8 +-
 ...test.js => emptyDescribeWithHooks.test.js} |   8 +-
 ..._error.test.js => emptySuiteError.test.js} |   0
 ...ated.test.js => errorOnDeprecated.test.js} |   2 +-
 ...nce-in-mpr.js => executeTestsOnceInMpr.js} |   0
 ...her.test.js => expectAsyncMatcher.test.js} |   0
 ...xpect_in_vm.test.js => expectInVm.test.js} |   0
 e2e/__tests__/failures.test.js                |  24 ++--
 ...-promises.test.js => fakePromises.test.js} |   0
 ...files.test.js => findRelatedFiles.test.js} |   2 +-
 .../{force_exit.test.js => forceExit.test.js} |   2 +-
 ...tor_mock.test.js => generatorMock.test.js} |   0
 ...obal_setup.test.js => globalSetup.test.js} |   4 +-
 ...eardown.test.js => globalTeardown.test.js} |   4 +-
 e2e/__tests__/globals.test.js                 |  20 ++--
 ..._map_sha1.test.js => hasteMapSha1.test.js} |   8 +-
 ..._map_size.test.js => hasteMapSize.test.js} |   0
 ...ine_async.test.js => jasmineAsync.test.js} |  20 ++--
 ...s => jasmineAsyncWithPendingDuringTest.js} |   2 +-
 ...files.test.js => jestChangedFiles.test.js} | 110 +++++++++---------
 ...tual.test.js => jestRequireActual.test.js} |   2 +-
 ...e_mock.test.js => jestRequireMock.test.js} |   2 +-
 ..._reporter.test.js => jsonReporter.test.js} |   0
 .../{list_tests.test.js => listTests.test.js} |   0
 ...ults.test.js => locationInResults.test.js} |   0
 ...eap_usage.test.js => logHeapUsage.test.js} |   0
 .../{mock_names.test.js => mockNames.test.js} |   0
 ...apper.test.js => moduleNameMapper.test.js} |   0
 ...l_in_test.js => moduleParentNullInTest.js} |   2 +-
 ...ner.test.js => multiProjectRunner.test.js} |   6 +-
 ...c_mock.test.js => nativeAsyncMock.test.js} |   0
 ...t_loop.test.js => nestedEventLoop.test.js} |   0
 ...test_found.test.js => noTestFound.test.js} |   0
 ...sts_found.test.js => noTestsFound.test.js} |   0
 .../{node_path.test.js => nodePath.test.js}   |   0
 ...ly_changed.test.js => onlyChanged.test.js} |   0
 ...lobals.test.js => overrideGlobals.test.js} |   0
 ...ocess_exit.test.js => processExit.test.js} |   0
 ...e_reject.test.js => promiseReject.test.js} |   2 +-
 ...n_path.test.js => regexCharInPath.test.js} |   0
 ...n.test.js => requireAfterTeardown.test.js} |   2 +-
 ...quire_main.test.js => requireMain.test.js} |   0
 ...module.test.js => requireV8Module.test.js} |   0
 ...t_modules.test.js => resetModules.test.js} |   2 +-
 ...-paths.test.js => resolveGetPaths.test.js} |   0
 ...est.js => resolveNoFileExtensions.test.js} |   6 +-
 ...dule.test.js => resolveNodeModule.test.js} |   0
 ...paths.test.js => resolveWithPaths.test.js} |   0
 ...by_path.test.js => runTestsByPath.test.js} |   2 +-
 ... => runtimeInternalModuleRegistry.test.js} |   0
 ...immediate.test.js => setImmediate.test.js} |   0
 ...st.js => setupFilesAfterEnvConfig.test.js} |   4 +-
 ...show_config.test.js => showConfig.test.js} |   4 +-
 e2e/__tests__/snapshot.test.js                |  14 +--
 ...mock-fs.test.js => snapshotMockFs.test.js} |   0
 ...olver.test.js => snapshotResolver.test.js} |   0
 ...rs.test.js => snapshotSerializers.test.js} |   0
 ...stack_trace.test.js => stackTrace.test.js} |  30 ++---
 ... => stackTraceNoCaptureStackTrace.test.js} |   0
 ...s.test.js => stackTraceSourceMaps.test.js} |   0
 ...s-dashed-args.js => supportsDashedArgs.js} |   0
 ...onment.test.js => testEnvironment.test.js} |   0
 ...c.test.js => testEnvironmentAsync.test.js} |   0
 ...de.test.js => testFailureExitCode.test.js} |   2 +-
 ...est_in_root.test.js => testInRoot.test.js} |   0
 ...attern.test.js => testNamePattern.test.js} |   2 +-
 ...test.js => testNamePatternSkipped.test.js} |   2 +-
 ...=> testPathPatternReporterMessage.test.js} |   2 +-
 ...r.test.js => testResultsProcessor.test.js} |   4 +-
 ...st_retries.test.js => testRetries.test.js} |   0
 .../{test-todo.test.js => testTodo.test.js}   |   6 +-
 ..._legacy.test.js => timeoutsLegacy.test.js} |   0
 ..._mocks.test.js => timerResetMocks.test.js} |   0
 ...ers.test.js => timerUseRealTimers.test.js} |   0
 ....test.js => toMatchInlineSnapshot.test.js} |   2 +-
 ...apshot.test.js => toMatchSnapshot.test.js} |   2 +-
 ...oThrowErrorMatchingInlineSnapshot.test.js} |   5 +-
 ...s => toThrowErrorMatchingSnapshot.test.js} |   2 +-
 e2e/__tests__/transform.test.js               |  12 +-
 ...test.js => transformLinkedModules.test.js} |   0
 ...age.test.js => typescriptCoverage.test.js} |   0
 ...-token.test.js => unexpectedToken.test.js} |   0
 .../{use_stderr.test.js => useStderr.test.js} |   2 +-
 e2e/__tests__/version.test.js                 |   2 +-
 ...ed.test.js => watchModeOnlyFailed.test.js} |   2 +-
 ...erns.test.js => watchModePatterns.test.js} |   2 +-
 ...est.js => watchModeUpdateSnapshot.test.js} |   2 +-
 ...test.js => integrationAutomockOff.test.js} |   0
 .../{bad-source-map.js => badSourceMap.js}    |   2 +-
 ...-source-map.js.map => badSourceMap.js.map} |   2 +-
 ...ered.test.js => beforeAllFiltered.test.js} |   0
 ...-queue.test.js => beforeEachQueue.test.js} |   0
 .../{browser-test.js => browserTest.js}       |   0
 ...clear_cache.test.js => clearCache.test.js} |   0
 ...failed-assertion.js => failedAssertion.js} |   0
 .../{covered-test.ts => coveredTest.ts}       |   0
 e2e/coverage-remapping/package.json           |   2 +-
 ...processor.js => typescriptPreprocessor.js} |   0
 .../{SumDependency.js => sumDependency.js}    |   0
 .../__tests__/{Sum.test.js => sum.test.js}    |   4 +-
 .../{Identical.test.js => identical.test.js}  |   2 +-
 .../a/{Identical.js => identical.js}          |   0
 .../{Identical.test.js => identical.test.js}  |   2 +-
 .../b/{Identical.js => identical.js}          |   0
 .../{OtherFile.js => otherFile.js}            |   0
 e2e/coverage-report/{Sum.js => sum.js}        |   4 +-
 .../{SumDependency.js => sumDependency.js}    |   0
 .../{covered-test.js => coveredTest.js}       |   0
 .../package.json                              |   2 +-
 .../{Preprocessor.js => preprocessor.js}      |   0
 ..._matcher.test.js => customMatcher.test.js} |   0
 .../{add_fail.test.js => addFail.test.js}     |   0
 .../{manual-mock.js => manualMock.js}         |   0
 ...esolver.test.js => customResolver.test.js} |   4 +-
 ...fake-regenerator.js => fakeRegenerator.js} |   0
 .../{manual-mock.js => manualMock.js}         |   0
 e2e/custom-resolver/resolver.js               |   2 +-
 ...ribe-only.test.js => describeOnly.test.js} |   0
 ...xception.test.js => eachException.test.js} |   0
 .../{each-only.test.js => eachOnly.test.js}   |   0
 .../{each-skip.test.js => eachSkip.test.js}   |   0
 ... => hookInDescribeWithSkippedTest.test.js} |   0
 ...be.test.js => hookInEmptyDescribe.test.js} |   0
 ...t.js => hookInEmptyNestedDescribe.test.js} |   0
 ...s => multipleHooksInEmptyDescribe.test.js} |   0
 ...empty_suite.test.js => emptySuite.test.js} |   0
 ...test.js => defaultTimeoutInterval.test.js} |   2 +-
 ...est.js.snap => snapshotNamed.test.js.snap} |   0
 ...n_count.test.js => assertionCount.test.js} |   0
 ...n_error.test.js => assertionError.test.js} |   0
 ...failures.test.js => asyncFailures.test.js} |   0
 ...ring_tests.test.js => duringTests.test.js} |   0
 ...ot_named.test.js => snapshotNamed.test.js} |   0
 .../{test_macro.test.js => testMacro.test.js} |   0
 ...row_number.test.js => throwNumber.test.js} |   0
 ...row_object.test.js => throwObject.test.js} |   0
 ...row_string.test.js => throwString.test.js} |   0
 ...tor_mock.test.js => generatorMock.test.js} |   0
 .../pass.test.js                              |   0
 .../{invalid_setup.js => invalidSetup.js}     |   0
 ...etup-with-config.js => setupWithConfig.js} |   0
 .../pass.test.js                              |   0
 ...invalid_teardown.js => invalidTeardown.js} |   0
 ...n-with-config.js => teardownWithConfig.js} |   0
 ...t_fails.test.js => asyncTestFails.test.js} |   0
 ...omise.test.js => pendingInPromise.test.js} |   0
 ...er_all.test.js => promiseAfterAll.test.js} |   0
 ..._each.test.js => promiseAfterEach.test.js} |   0
 ...e_all.test.js => promiseBeforeAll.test.js} |   0
 ...each.test.js => promiseBeforeEach.test.js} |   0
 ...promise_fit.test.js => promiseFit.test.js} |   0
 .../{promise_it.test.js => promiseIt.test.js} |   0
 ...promise_xit.test.js => promiseXit.test.js} |   0
 ...values.test.js => returningValues.test.js} |   0
 .../__mocks__/{style_mock.js => styleMock.js} |   0
 .../package.json                              |   2 +-
 .../__tests__/index.js                        |   0
 .../package.json                              |   0
 .../{boggus-bar.test.js => boggusBar.test.js} |   0
 .../{boggus-foo.test.js => boggusFoo.test.js} |   0
 ...c_mock.test.js => nativeAsyncMock.test.js} |   0
 ...t_loop.test.js => nestedEventLoop.test.js} |   0
 .../{node_path.test.js => nodePath.test.js}   |   0
 ...n_path.test.js => regexCharInPath.test.js} |   0
 ...te-require.test.js => lateRequire.test.js} |   0
 .../__tests__/resetModules.test.js}           |   0
 .../package.json                              |   0
 ...-paths.test.js => resolveGetPaths.test.js} |   0
 .../__tests__/test.js                         |   0
 .../babel.config.js                           |   0
 .../index.js                                  |   0
 .../package.json                              |   0
 .../some-json-file.json                       |   0
 ...paths.test.js => resolveWithPaths.test.js} |   0
 ... => runtimeInternalModuleRegistry.test.js} |   0
 ...immediate.test.js => setImmediate.test.js} |   0
 ...nner_patch.test.js => runnerPatch.test.js} |   0
 ...into_runner.js => setupHooksIntoRunner.js} |   0
 ...escape_regex.js => snapshotEscapeRegex.js} |   0
 ....js => snapshotEscapeSubstitution.test.js} |   0
 e2e/snapshot-serializers/package.json         |   2 +-
 e2e/snapshot-serializers/plugins/bar.js       |   2 +-
 e2e/snapshot-serializers/plugins/foo/index.js |   2 +-
 .../{Transformer.js => transformer.js}        |   0
 .../{Utils.js => utils.js}                    |   0
 ...napshot.test.js => secondSnapshot.test.js} |   0
 ...ime_error.test.js => runtimeError.test.js} |   0
 e2e/stack-trace-source-maps/package.json      |   2 +-
 .../{Preprocessor.js => preprocessor.js}      |   0
 ...ime_error.test.js => runtimeError.test.js} |   0
 ...stack_trace.test.js => stackTrace.test.js} |   0
 ...st.js => stackTraceWithoutMessage.test.js} |   0
 .../{test_error.test.js => testError.test.js} |   0
 .../__tests__/testNamePatternSkipped.test.js} |   0
 .../package.json                              |   0
 .../__tests__/testNamePattern.test.js}        |   0
 .../package.json                              |   0
 .../__tests__/processor.test.js               |   0
 .../package.json                              |   0
 .../processor.js                              |   0
 ..._args.test.js => todoMultipleArgs.test.js} |   0
 ...odo_no_args.test.js => todoNoArgs.test.js} |   0
 ...n_string.test.js => todoNonString.test.js} |   0
 ..._and_mock.test.js => timerAndMock.test.js} |   0
 ...ith_mock.test.js => timerWithMock.test.js} |   0
 ...l_timers.test.js => useRealTimers.test.js} |   0
 .../babel.config.js                           |   0
 .../package.json                              |   0
 .../package.json                              |   0
 .../babel.config.js                           |   0
 .../package.json                              |   0
 .../package.json                              |   0
 ...-modules.test.js => linkedModules.test.js} |   0
 e2e/transform-linked-modules/package.json     |   2 +-
 .../{Preprocessor.js => preprocessor.js}      |   0
 .../{babel_jest.test.js => babelJest.test.js} |   2 +-
 ...changed_cwd.test.js => changedCwd.test.js} |   2 +-
 .../{NotCovered.js => notCovered.js}          |   0
 e2e/transform/babel-jest/package.json         |   6 +-
 .../{Covered.js => covered.js}                |   0
 ...romCoverage.js => excludedFromCoverage.js} |   4 +-
 ...sor.test.js => customPreprocessor.test.js} |   0
 .../package.json                              |   2 +-
 .../{Preprocessor.js => preprocessor.js}      |   0
 ...pport.mjs => ecmascriptModulesSupport.mjs} |   0
 ...snap => multipleTransformers.test.js.snap} |   0
 ...s.test.js => multipleTransformers.test.js} |   0
 ...{CssPreprocessor.js => cssPreprocessor.js} |   0
 ...ilePreprocessor.js => filePreprocessor.js} |   0
 .../{JsPreprocessor.js => jsPreprocessor.js}  |   0
 .../multiple-transformers/package.json        |   6 +-
 ...r.test.js => failsWithSyntaxError.test.js} |   0
 ...babel-jest.js => passesWithNoBabelJest.js} |   2 +-
 e2e/transform/no-babel-jest/package.json      |   6 +-
 .../{Covered.js => covered.js}                |   0
 ...romCoverage.js => excludedFromCoverage.js} |   2 +-
 .../{covered-test.ts => coveredTest.ts}       |   0
 e2e/typescript-coverage/package.json          |   2 +-
 ...processor.js => typescriptPreprocessor.js} |   0
 karma.conf.js                                 |   4 +-
 307 files changed, 401 insertions(+), 400 deletions(-)
 delete mode 100644 e2e/__tests__/__snapshots__/before-all-filtered.js.snap
 delete mode 100644 e2e/__tests__/__snapshots__/before-each-queue.js.snap
 create mode 100644 e2e/__tests__/__snapshots__/beforeAllFiltered.js.snap
 create mode 100644 e2e/__tests__/__snapshots__/beforeEachQueue.js.snap
 rename e2e/__tests__/__snapshots__/{cli-handles-exact-filenames.test.js.snap => cliHandlesExactFilenames.test.js.snap} (100%)
 rename e2e/__tests__/__snapshots__/{console_log_output_when_run_in_band.test.js.snap => consoleLogOutputWhenRunInBand.test.js.snap} (100%)
 rename e2e/__tests__/__snapshots__/{coverage_remapping.test.js.snap => coverageRemapping.test.js.snap} (100%)
 rename e2e/__tests__/__snapshots__/{coverage_report.test.js.snap => coverageReport.test.js.snap} (83%)
 rename e2e/__tests__/__snapshots__/{coverage_threshold.test.js.snap => coverageThreshold.test.js.snap} (100%)
 rename e2e/__tests__/__snapshots__/{coverage_transform_instrumented.test.js.snap => coverageTransformInstrumented.test.js.snap} (100%)
 rename e2e/__tests__/__snapshots__/{custom_matcher_stack_trace.test.js.snap => customMatcherStackTrace.test.js.snap} (54%)
 rename e2e/__tests__/__snapshots__/{custom_reporters.test.js.snap => customReporters.test.js.snap} (100%)
 rename e2e/__tests__/__snapshots__/{detect_open_handles.js.snap => detectOpenHandles.js.snap} (100%)
 rename e2e/__tests__/__snapshots__/{empty-describe-with-hooks.test.js.snap => emptyDescribeWithHooks.test.js.snap} (65%)
 rename e2e/__tests__/__snapshots__/{error-on-deprecated.test.js.snap => errorOnDeprecated.test.js.snap} (94%)
 rename e2e/__tests__/__snapshots__/{execute-tests-once-in-mpr.js.snap => executeTestsOnceInMpr.js.snap} (100%)
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 rename e2e/test-todo/__tests__/{todo_multiple_args.test.js => todoMultipleArgs.test.js} (100%)
 rename e2e/test-todo/__tests__/{todo_no_args.test.js => todoNoArgs.test.js} (100%)
 rename e2e/test-todo/__tests__/{todo_non_string.test.js => todoNonString.test.js} (100%)
 rename e2e/timer-reset-mocks/after-reset-all-mocks/{timer_and_mock.test.js => timerAndMock.test.js} (100%)
 rename e2e/timer-reset-mocks/with-reset-mocks/{timer_with_mock.test.js => timerWithMock.test.js} (100%)
 rename e2e/timer-use-real-timers/__tests__/{use_real_timers.test.js => useRealTimers.test.js} (100%)
 rename e2e/{toMatchInlineSnapshot => to-match-inline-snapshot}/babel.config.js (100%)
 rename e2e/{toMatchInlineSnapshot => to-match-inline-snapshot}/package.json (100%)
 rename e2e/{toMatchSnapshot => to-match-snapshot}/package.json (100%)
 rename e2e/{toThrowErrorMatchingInlineSnapshot => to-throw-error-matching-inline-snapshot}/babel.config.js (100%)
 rename e2e/{toThrowErrorMatchingInlineSnapshot => to-throw-error-matching-inline-snapshot}/package.json (100%)
 rename e2e/{toThrowErrorMatchingSnapshot => to-throw-error-matching-snapshot}/package.json (100%)
 rename e2e/transform-linked-modules/__tests__/{linked-modules.test.js => linkedModules.test.js} (100%)
 rename e2e/transform-linked-modules/{Preprocessor.js => preprocessor.js} (100%)
 rename e2e/transform/babel-jest/__tests__/{babel_jest.test.js => babelJest.test.js} (84%)
 rename e2e/transform/babel-jest/__tests__/{changed_cwd.test.js => changedCwd.test.js} (88%)
 rename e2e/transform/babel-jest/{NotCovered.js => notCovered.js} (100%)
 rename e2e/transform/babel-jest/this-directory-is-covered/{Covered.js => covered.js} (100%)
 rename e2e/transform/babel-jest/this-directory-is-covered/{ExcludedFromCoverage.js => excludedFromCoverage.js} (87%)
 rename e2e/transform/custom-instrumenting-preprocessor/__tests__/{custom_preprocessor.test.js => customPreprocessor.test.js} (100%)
 rename e2e/transform/custom-instrumenting-preprocessor/{Preprocessor.js => preprocessor.js} (100%)
 rename e2e/transform/ecmascript-modules-support/__tests__/{ecmascript-modules-support.mjs => ecmascriptModulesSupport.mjs} (100%)
 rename e2e/transform/multiple-transformers/__tests__/__snapshots__/{multiple_transformers.test.js.snap => multipleTransformers.test.js.snap} (100%)
 rename e2e/transform/multiple-transformers/__tests__/{multiple_transformers.test.js => multipleTransformers.test.js} (100%)
 rename e2e/transform/multiple-transformers/{CssPreprocessor.js => cssPreprocessor.js} (100%)
 rename e2e/transform/multiple-transformers/{FilePreprocessor.js => filePreprocessor.js} (100%)
 rename e2e/transform/multiple-transformers/{JsPreprocessor.js => jsPreprocessor.js} (100%)
 rename e2e/transform/no-babel-jest/__tests__/{fails_with_syntax_error.test.js => failsWithSyntaxError.test.js} (100%)
 rename e2e/transform/no-babel-jest/__tests__/{passes-with-no-babel-jest.js => passesWithNoBabelJest.js} (80%)
 rename e2e/transform/no-babel-jest/this-directory-is-covered/{Covered.js => covered.js} (100%)
 rename e2e/transform/no-babel-jest/this-directory-is-covered/{ExcludedFromCoverage.js => excludedFromCoverage.js} (93%)
 rename e2e/typescript-coverage/__tests__/{covered-test.ts => coveredTest.ts} (100%)
 rename e2e/typescript-coverage/{TypescriptPreprocessor.js => typescriptPreprocessor.js} (100%)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9efb72ecf5a0..e2203c316f1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -147,7 +147,7 @@
 - `[jest-haste-map]` Refactor `dependencyExtractor` and tests ([#7385](https://github.com/facebook/jest/pull/7385))
 - `[docs]` Clearify conditional setting of `NODE_ENV` ([#7369](https://github.com/facebook/jest/pull/7369))
 - `[docs]` Clarify conditional setting of `NODE_ENV` ([#7369](https://github.com/facebook/jest/pull/7369))
-- `[*]` Standardize file names ([#7316](https://github.com/facebook/jest/pull/7316), [#7266](https://github.com/facebook/jest/pull/7266), [#7238](https://github.com/facebook/jest/pull/7238), [#7314](https://github.com/facebook/jest/pull/7314), [#7467](https://github.com/facebook/jest/pull/7467), [#7464](https://github.com/facebook/jest/pull/7464))
+- `[*]` Standardize file names ([#7316](https://github.com/facebook/jest/pull/7316), [#7266](https://github.com/facebook/jest/pull/7266), [#7238](https://github.com/facebook/jest/pull/7238), [#7314](https://github.com/facebook/jest/pull/7314), [#7467](https://github.com/facebook/jest/pull/7467), [#7464](https://github.com/facebook/jest/pull/7464)), [#7471](https://github.com/facebook/jest/pull/7471))
 - `[docs]` Add `testPathIgnorePatterns` in CLI documentation ([#7440](https://github.com/facebook/jest/pull/7440))
 - `[docs]` Removed misleading text about `describe()` grouping together tests into a test suite ([#7434](https://github.com/facebook/jest/pull/7434))
 
diff --git a/e2e/__tests__/__snapshots__/before-all-filtered.js.snap b/e2e/__tests__/__snapshots__/before-all-filtered.js.snap
deleted file mode 100644
index 5d614a1b0132..000000000000
--- a/e2e/__tests__/__snapshots__/before-all-filtered.js.snap
+++ /dev/null
@@ -1,19 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Correct BeforeAll run ensures the BeforeAll of ignored suite is not run 1`] = `
-"  console.log __tests__/before-all-filtered.test.js:5
-    beforeAll 1
-
-  console.log __tests__/before-all-filtered.test.js:8
-    beforeEach 1
-
-  console.log __tests__/before-all-filtered.test.js:17
-    It Foo
-
-  console.log __tests__/before-all-filtered.test.js:11
-    afterEach 1
-
-  console.log __tests__/before-all-filtered.test.js:14
-    afterAll 1
-"
-`;
diff --git a/e2e/__tests__/__snapshots__/before-each-queue.js.snap b/e2e/__tests__/__snapshots__/before-each-queue.js.snap
deleted file mode 100644
index edc7dc4cf516..000000000000
--- a/e2e/__tests__/__snapshots__/before-each-queue.js.snap
+++ /dev/null
@@ -1,19 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Correct beforeEach order ensures the correct order for beforeEach 1`] = `
-"  console.log __tests__/before-each-queue.test.js:5
-    BeforeEach
-
-  console.log __tests__/before-each-queue.test.js:9
-    It Foo
-
-  console.log __tests__/before-each-queue.test.js:12
-    BeforeEach Inline Foo
-
-  console.log __tests__/before-each-queue.test.js:5
-    BeforeEach
-
-  console.log __tests__/before-each-queue.test.js:17
-    It Bar
-"
-`;
diff --git a/e2e/__tests__/__snapshots__/beforeAllFiltered.js.snap b/e2e/__tests__/__snapshots__/beforeAllFiltered.js.snap
new file mode 100644
index 000000000000..3ee05080e1b2
--- /dev/null
+++ b/e2e/__tests__/__snapshots__/beforeAllFiltered.js.snap
@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Correct BeforeAll run ensures the BeforeAll of ignored suite is not run 1`] = `
+"  console.log __tests__/beforeAllFiltered.test.js:5
+    beforeAll 1
+
+  console.log __tests__/beforeAllFiltered.test.js:8
+    beforeEach 1
+
+  console.log __tests__/beforeAllFiltered.test.js:17
+    It Foo
+
+  console.log __tests__/beforeAllFiltered.test.js:11
+    afterEach 1
+
+  console.log __tests__/beforeAllFiltered.test.js:14
+    afterAll 1
+"
+`;
diff --git a/e2e/__tests__/__snapshots__/beforeEachQueue.js.snap b/e2e/__tests__/__snapshots__/beforeEachQueue.js.snap
new file mode 100644
index 000000000000..3e6c6f91d79d
--- /dev/null
+++ b/e2e/__tests__/__snapshots__/beforeEachQueue.js.snap
@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Correct beforeEach order ensures the correct order for beforeEach 1`] = `
+"  console.log __tests__/beforeEachQueue.test.js:5
+    BeforeEach
+
+  console.log __tests__/beforeEachQueue.test.js:9
+    It Foo
+
+  console.log __tests__/beforeEachQueue.test.js:12
+    BeforeEach Inline Foo
+
+  console.log __tests__/beforeEachQueue.test.js:5
+    BeforeEach
+
+  console.log __tests__/beforeEachQueue.test.js:17
+    It Bar
+"
+`;
diff --git a/e2e/__tests__/__snapshots__/cli-handles-exact-filenames.test.js.snap b/e2e/__tests__/__snapshots__/cliHandlesExactFilenames.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/cli-handles-exact-filenames.test.js.snap
rename to e2e/__tests__/__snapshots__/cliHandlesExactFilenames.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/console_log_output_when_run_in_band.test.js.snap b/e2e/__tests__/__snapshots__/consoleLogOutputWhenRunInBand.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/console_log_output_when_run_in_band.test.js.snap
rename to e2e/__tests__/__snapshots__/consoleLogOutputWhenRunInBand.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/coverage_remapping.test.js.snap b/e2e/__tests__/__snapshots__/coverageRemapping.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/coverage_remapping.test.js.snap
rename to e2e/__tests__/__snapshots__/coverageRemapping.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/coverage_report.test.js.snap b/e2e/__tests__/__snapshots__/coverageReport.test.js.snap
similarity index 83%
rename from e2e/__tests__/__snapshots__/coverage_report.test.js.snap
rename to e2e/__tests__/__snapshots__/coverageReport.test.js.snap
index 22b2a7a6ba06..aaf5bd50d645 100644
--- a/e2e/__tests__/__snapshots__/coverage_report.test.js.snap
+++ b/e2e/__tests__/__snapshots__/coverageReport.test.js.snap
@@ -6,9 +6,9 @@ File           |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
 ---------------|----------|----------|----------|----------|-------------------|
 All files      |      100 |      100 |      100 |      100 |                   |
  a             |      100 |      100 |      100 |      100 |                   |
-  Identical.js |      100 |      100 |      100 |      100 |                   |
+  identical.js |      100 |      100 |      100 |      100 |                   |
  b             |      100 |      100 |      100 |      100 |                   |
-  Identical.js |      100 |      100 |      100 |      100 |                   |
+  identical.js |      100 |      100 |      100 |      100 |                   |
 ---------------|----------|----------|----------|----------|-------------------|"
 `;
 
@@ -17,7 +17,7 @@ exports[`collects coverage only from multiple specified files 1`] = `
 File          |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
 --------------|----------|----------|----------|----------|-------------------|
 All files     |      100 |      100 |      100 |      100 |                   |
- OtherFile.js |      100 |      100 |      100 |      100 |                   |
+ otherFile.js |      100 |      100 |      100 |      100 |                   |
  setup.js     |      100 |      100 |      100 |      100 |                   |
 --------------|----------|----------|----------|----------|-------------------|"
 `;
@@ -36,7 +36,7 @@ exports[`collects coverage only from specified files avoiding dependencies 1`] =
 File      |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
 ----------|----------|----------|----------|----------|-------------------|
 All files |    85.71 |      100 |       50 |      100 |                   |
- Sum.js   |    85.71 |      100 |       50 |      100 |                   |
+ sum.js   |    85.71 |      100 |       50 |      100 |                   |
 ----------|----------|----------|----------|----------|-------------------|"
 `;
 
@@ -48,14 +48,14 @@ File                                 |  % Stmts | % Branch |  % Funcs |  % Lines
 -------------------------------------|----------|----------|----------|----------|-------------------|
 All files                            |    56.52 |        0 |       50 |    55.56 |                   |
  coverage-report                     |    41.18 |        0 |       25 |    42.86 |                   |
-  OtherFile.js                       |      100 |      100 |      100 |      100 |                   |
-  Sum.js                             |    85.71 |      100 |       50 |      100 |                   |
-  SumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
   notRequiredInTestSuite.js          |        0 |        0 |        0 |        0 |     8,15,16,17,19 |
+  otherFile.js                       |      100 |      100 |      100 |      100 |                   |
+  sum.js                             |    85.71 |      100 |       50 |      100 |                   |
+  sumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
  coverage-report/cached-duplicates/a |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
  coverage-report/cached-duplicates/b |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
 -------------------------------------|----------|----------|----------|----------|-------------------|"
 `;
 
@@ -74,14 +74,14 @@ File                                 |  % Stmts | % Branch |  % Funcs |  % Lines
 -------------------------------------|----------|----------|----------|----------|-------------------|
 All files                            |    56.52 |        0 |       50 |    55.56 |                   |
  coverage-report                     |    41.18 |        0 |       25 |    42.86 |                   |
-  OtherFile.js                       |      100 |      100 |      100 |      100 |                   |
-  Sum.js                             |    85.71 |      100 |       50 |      100 |                   |
-  SumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
   notRequiredInTestSuite.js          |        0 |        0 |        0 |        0 |     8,15,16,17,19 |
+  otherFile.js                       |      100 |      100 |      100 |      100 |                   |
+  sum.js                             |    85.71 |      100 |       50 |      100 |                   |
+  sumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
  coverage-report/cached-duplicates/a |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
  coverage-report/cached-duplicates/b |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
 -------------------------------------|----------|----------|----------|----------|-------------------|"
 `;
 
@@ -98,14 +98,14 @@ File                                 |  % Stmts | % Branch |  % Funcs |  % Lines
 -------------------------------------|----------|----------|----------|----------|-------------------|
 All files                            |    56.52 |        0 |       50 |    55.56 |                   |
  coverage-report                     |    41.18 |        0 |       25 |    42.86 |                   |
-  OtherFile.js                       |      100 |      100 |      100 |      100 |                   |
-  Sum.js                             |    85.71 |      100 |       50 |      100 |                   |
-  SumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
   notRequiredInTestSuite.js          |        0 |        0 |        0 |        0 |     8,15,16,17,19 |
+  otherFile.js                       |      100 |      100 |      100 |      100 |                   |
+  sum.js                             |    85.71 |      100 |       50 |      100 |                   |
+  sumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
  coverage-report/cached-duplicates/a |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
  coverage-report/cached-duplicates/b |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
 -------------------------------------|----------|----------|----------|----------|-------------------|"
 `;
 
@@ -115,14 +115,14 @@ File                                 |  % Stmts | % Branch |  % Funcs |  % Lines
 -------------------------------------|----------|----------|----------|----------|-------------------|
 All files                            |    56.52 |        0 |       50 |    55.56 |                   |
  coverage-report                     |    41.18 |        0 |       25 |    42.86 |                   |
-  OtherFile.js                       |      100 |      100 |      100 |      100 |                   |
-  Sum.js                             |    85.71 |      100 |       50 |      100 |                   |
-  SumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
   notRequiredInTestSuite.js          |        0 |        0 |        0 |        0 |     8,15,16,17,19 |
+  otherFile.js                       |      100 |      100 |      100 |      100 |                   |
+  sum.js                             |    85.71 |      100 |       50 |      100 |                   |
+  sumDependency.js                   |        0 |        0 |        0 |        0 |           8,10,12 |
  coverage-report/cached-duplicates/a |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
  coverage-report/cached-duplicates/b |      100 |      100 |      100 |      100 |                   |
-  Identical.js                       |      100 |      100 |      100 |      100 |                   |
+  identical.js                       |      100 |      100 |      100 |      100 |                   |
 -------------------------------------|----------|----------|----------|----------|-------------------|"
 `;
 
diff --git a/e2e/__tests__/__snapshots__/coverage_threshold.test.js.snap b/e2e/__tests__/__snapshots__/coverageThreshold.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/coverage_threshold.test.js.snap
rename to e2e/__tests__/__snapshots__/coverageThreshold.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/coverage_transform_instrumented.test.js.snap b/e2e/__tests__/__snapshots__/coverageTransformInstrumented.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/coverage_transform_instrumented.test.js.snap
rename to e2e/__tests__/__snapshots__/coverageTransformInstrumented.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/custom_matcher_stack_trace.test.js.snap b/e2e/__tests__/__snapshots__/customMatcherStackTrace.test.js.snap
similarity index 54%
rename from e2e/__tests__/__snapshots__/custom_matcher_stack_trace.test.js.snap
rename to e2e/__tests__/__snapshots__/customMatcherStackTrace.test.js.snap
index c0a01cdeb5a7..49b4afe4098c 100644
--- a/e2e/__tests__/__snapshots__/custom_matcher_stack_trace.test.js.snap
+++ b/e2e/__tests__/__snapshots__/customMatcherStackTrace.test.js.snap
@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`works with custom matchers 1`] = `
-"FAIL __tests__/custom_matcher.test.js
+"FAIL __tests__/customMatcher.test.js
   Custom matcher
     ✓ passes
     ✓ fails
@@ -19,12 +19,12 @@ exports[`works with custom matchers 1`] = `
       47 | 
       48 |     // This expecation fails due to an error we throw (intentionally)
 
-      at Error (__tests__/custom_matcher.test.js:45:13)
-      at baz (__tests__/custom_matcher.test.js:43:23)
-      at bar (__tests__/custom_matcher.test.js:42:23)
-      at foo (__tests__/custom_matcher.test.js:52:7)
-      at Object.callback (__tests__/custom_matcher.test.js:11:18)
-      at Object.toCustomMatch (__tests__/custom_matcher.test.js:53:8)
+      at Error (__tests__/customMatcher.test.js:45:13)
+      at baz (__tests__/customMatcher.test.js:43:23)
+      at bar (__tests__/customMatcher.test.js:42:23)
+      at foo (__tests__/customMatcher.test.js:52:7)
+      at Object.callback (__tests__/customMatcher.test.js:11:18)
+      at Object.toCustomMatch (__tests__/customMatcher.test.js:53:8)
 
 "
 `;
diff --git a/e2e/__tests__/__snapshots__/custom_reporters.test.js.snap b/e2e/__tests__/__snapshots__/customReporters.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/custom_reporters.test.js.snap
rename to e2e/__tests__/__snapshots__/customReporters.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/detect_open_handles.js.snap b/e2e/__tests__/__snapshots__/detectOpenHandles.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/detect_open_handles.js.snap
rename to e2e/__tests__/__snapshots__/detectOpenHandles.js.snap
diff --git a/e2e/__tests__/__snapshots__/each.test.js.snap b/e2e/__tests__/__snapshots__/each.test.js.snap
index 3ed64877ce88..662a0870b471 100644
--- a/e2e/__tests__/__snapshots__/each.test.js.snap
+++ b/e2e/__tests__/__snapshots__/each.test.js.snap
@@ -35,7 +35,7 @@ exports[`formats args with pretty format when given %p 1`] = `
 `;
 
 exports[`runs only the describe.only.each tests 1`] = `
-"PASS __tests__/describe-only.test.js
+"PASS __tests__/describeOnly.test.js
   passes all rows expected true == true
     ✓ passes
     ✓ passes
@@ -46,7 +46,7 @@ exports[`runs only the describe.only.each tests 1`] = `
 `;
 
 exports[`shows error message when not enough arguments are supplied to tests 1`] = `
-"FAIL __tests__/each-exception.test.js
+"FAIL __tests__/eachException.test.js
   ✕ throws exception when one argument too few are supplied $left == $right
   ✕ throws exception when not enough arguments are supplied $left == $right
 
@@ -72,7 +72,7 @@ exports[`shows error message when not enough arguments are supplied to tests 1`]
       10 |   \${true} | \${true}
       11 |   \${true}
 
-      at Object.<anonymous> (__tests__/each-exception.test.js:8:1)
+      at Object.<anonymous> (__tests__/eachException.test.js:8:1)
 
   ● throws exception when not enough arguments are supplied $left == $right
 
@@ -95,13 +95,13 @@ exports[`shows error message when not enough arguments are supplied to tests 1`]
       21 |   \${true} | \${true}
       22 | \`(
 
-      at Object.<anonymous> (__tests__/each-exception.test.js:19:1)
+      at Object.<anonymous> (__tests__/eachException.test.js:19:1)
 
 "
 `;
 
 exports[`shows only the tests with .only as being ran 1`] = `
-"PASS __tests__/each-only.test.js
+"PASS __tests__/eachOnly.test.js
   ✓ passes one row expected true == true
   ✓ passes one row expected true == true
   ✓ passes one row expected true == true
@@ -112,7 +112,7 @@ exports[`shows only the tests with .only as being ran 1`] = `
 `;
 
 exports[`shows only the tests without .skip as being ran 1`] = `
-"PASS __tests__/each-skip.test.js
+"PASS __tests__/eachSkip.test.js
   ✓ passes one row expected true == true
   ✓ passes one row expected true == true
   ✓ passes one row expected true == true
diff --git a/e2e/__tests__/__snapshots__/empty-describe-with-hooks.test.js.snap b/e2e/__tests__/__snapshots__/emptyDescribeWithHooks.test.js.snap
similarity index 65%
rename from e2e/__tests__/__snapshots__/empty-describe-with-hooks.test.js.snap
rename to e2e/__tests__/__snapshots__/emptyDescribeWithHooks.test.js.snap
index 1bd884cd09fe..4c8744c30973 100644
--- a/e2e/__tests__/__snapshots__/empty-describe-with-hooks.test.js.snap
+++ b/e2e/__tests__/__snapshots__/emptyDescribeWithHooks.test.js.snap
@@ -7,13 +7,13 @@ Object {
 Tests:       1 skipped, 1 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /hook-in-describe-with-skipped-test.test.js/i.",
+Ran all test suites matching /hookInDescribeWithSkippedTest.test.js/i.",
 }
 `;
 
 exports[`hook in empty describe 1`] = `
 Object {
-  "rest": "FAIL __tests__/hook-in-empty-describe.test.js
+  "rest": "FAIL __tests__/hookInEmptyDescribe.test.js
 
 
   ● Test suite failed to run
@@ -28,22 +28,22 @@ Object {
       11 | 
       12 | describe('another block with tests', () => {
 
-      at beforeEach (__tests__/hook-in-empty-describe.test.js:9:3)
-      at Object.describe (__tests__/hook-in-empty-describe.test.js:8:1)
+      at beforeEach (__tests__/hookInEmptyDescribe.test.js:9:3)
+      at Object.describe (__tests__/hookInEmptyDescribe.test.js:8:1)
 
 ",
   "summary": "Test Suites: 1 failed, 1 total
 Tests:       1 passed, 1 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /hook-in-empty-describe.test.js/i.
+Ran all test suites matching /hookInEmptyDescribe.test.js/i.
 ",
 }
 `;
 
 exports[`hook in empty nested describe 1`] = `
 Object {
-  "rest": "FAIL __tests__/hook-in-empty-nested-describe.test.js
+  "rest": "FAIL __tests__/hookInEmptyNestedDescribe.test.js
 
 
   ● Test suite failed to run
@@ -58,22 +58,22 @@ Object {
       11 | });
       12 | 
 
-      at beforeEach (__tests__/hook-in-empty-nested-describe.test.js:9:3)
-      at Object.describe (__tests__/hook-in-empty-nested-describe.test.js:8:1)
+      at beforeEach (__tests__/hookInEmptyNestedDescribe.test.js:9:3)
+      at Object.describe (__tests__/hookInEmptyNestedDescribe.test.js:8:1)
 
 ",
   "summary": "Test Suites: 1 failed, 1 total
 Tests:       1 passed, 1 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /hook-in-empty-nested-describe.test.js/i.
+Ran all test suites matching /hookInEmptyNestedDescribe.test.js/i.
 ",
 }
 `;
 
 exports[`multiple hooks in empty describe 1`] = `
 Object {
-  "rest": "FAIL __tests__/multiple-hooks-in-empty-describe.test.js
+  "rest": "FAIL __tests__/multipleHooksInEmptyDescribe.test.js
 
 
   ● Test suite failed to run
@@ -88,8 +88,8 @@ Object {
       11 |   afterAll(() => {});
       12 |   beforeAll(() => {});
 
-      at beforeEach (__tests__/multiple-hooks-in-empty-describe.test.js:9:3)
-      at Object.describe (__tests__/multiple-hooks-in-empty-describe.test.js:8:1)
+      at beforeEach (__tests__/multipleHooksInEmptyDescribe.test.js:9:3)
+      at Object.describe (__tests__/multipleHooksInEmptyDescribe.test.js:8:1)
 
   ● Test suite failed to run
 
@@ -103,8 +103,8 @@ Object {
       12 |   beforeAll(() => {});
       13 | });
 
-      at afterEach (__tests__/multiple-hooks-in-empty-describe.test.js:10:3)
-      at Object.describe (__tests__/multiple-hooks-in-empty-describe.test.js:8:1)
+      at afterEach (__tests__/multipleHooksInEmptyDescribe.test.js:10:3)
+      at Object.describe (__tests__/multipleHooksInEmptyDescribe.test.js:8:1)
 
   ● Test suite failed to run
 
@@ -118,8 +118,8 @@ Object {
       13 | });
       14 | 
 
-      at afterAll (__tests__/multiple-hooks-in-empty-describe.test.js:11:3)
-      at Object.describe (__tests__/multiple-hooks-in-empty-describe.test.js:8:1)
+      at afterAll (__tests__/multipleHooksInEmptyDescribe.test.js:11:3)
+      at Object.describe (__tests__/multipleHooksInEmptyDescribe.test.js:8:1)
 
   ● Test suite failed to run
 
@@ -133,15 +133,15 @@ Object {
       14 | 
       15 | describe('another block with tests', () => {
 
-      at beforeAll (__tests__/multiple-hooks-in-empty-describe.test.js:12:3)
-      at Object.describe (__tests__/multiple-hooks-in-empty-describe.test.js:8:1)
+      at beforeAll (__tests__/multipleHooksInEmptyDescribe.test.js:12:3)
+      at Object.describe (__tests__/multipleHooksInEmptyDescribe.test.js:8:1)
 
 ",
   "summary": "Test Suites: 1 failed, 1 total
 Tests:       1 passed, 1 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /multiple-hooks-in-empty-describe.test.js/i.
+Ran all test suites matching /multipleHooksInEmptyDescribe.test.js/i.
 ",
 }
 `;
diff --git a/e2e/__tests__/__snapshots__/error-on-deprecated.test.js.snap b/e2e/__tests__/__snapshots__/errorOnDeprecated.test.js.snap
similarity index 94%
rename from e2e/__tests__/__snapshots__/error-on-deprecated.test.js.snap
rename to e2e/__tests__/__snapshots__/errorOnDeprecated.test.js.snap
index fe2095c9428b..e2857a9525b7 100644
--- a/e2e/__tests__/__snapshots__/error-on-deprecated.test.js.snap
+++ b/e2e/__tests__/__snapshots__/errorOnDeprecated.test.js.snap
@@ -1,22 +1,22 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`DEFAULT_TIMEOUT_INTERVAL.test.js errors in errorOnDeprecated mode 1`] = `
-"FAIL __tests__/DEFAULT_TIMEOUT_INTERVAL.test.js
-  ✕ DEFAULT_TIMEOUT_INTERVAL
+exports[`defaultTimeoutInterval.test.js errors in errorOnDeprecated mode 1`] = `
+"FAIL __tests__/defaultTimeoutInterval.test.js
+  ✕ Default Timeout Interval
 
-  ● DEFAULT_TIMEOUT_INTERVAL
+  ● Default Timeout Interval
 
     Illegal usage of \`jasmine.DEFAULT_TIMEOUT_INTERVAL\`, prefer \`jest.setTimeout\`.
 
        8 | 
-       9 | test('DEFAULT_TIMEOUT_INTERVAL', () => {
+       9 | test('Default Timeout Interval', () => {
     > 10 |   jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000;
          |   ^
       11 |   expect(true).toBe(true);
       12 | });
       13 | 
 
-      at Object.<anonymous>.test (__tests__/DEFAULT_TIMEOUT_INTERVAL.test.js:10:3)
+      at Object.<anonymous>.test (__tests__/defaultTimeoutInterval.test.js:10:3)
 
 "
 `;
diff --git a/e2e/__tests__/__snapshots__/execute-tests-once-in-mpr.js.snap b/e2e/__tests__/__snapshots__/executeTestsOnceInMpr.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/execute-tests-once-in-mpr.js.snap
rename to e2e/__tests__/__snapshots__/executeTestsOnceInMpr.js.snap
diff --git a/e2e/__tests__/__snapshots__/expect-async-matcher.test.js.snap b/e2e/__tests__/__snapshots__/expectAsyncMatcher.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/expect-async-matcher.test.js.snap
rename to e2e/__tests__/__snapshots__/expectAsyncMatcher.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/failures.test.js.snap b/e2e/__tests__/__snapshots__/failures.test.js.snap
index 4c00d72b044f..ed91a4e39997 100644
--- a/e2e/__tests__/__snapshots__/failures.test.js.snap
+++ b/e2e/__tests__/__snapshots__/failures.test.js.snap
@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`not throwing Error objects 1`] = `
-"FAIL __tests__/throw_number.test.js
+"FAIL __tests__/throwNumber.test.js
   ● Test suite failed to run
 
     Expected an Error, but \\"1\\" was thrown
@@ -10,7 +10,7 @@ exports[`not throwing Error objects 1`] = `
 `;
 
 exports[`not throwing Error objects 2`] = `
-"FAIL __tests__/throw_string.test.js
+"FAIL __tests__/throwString.test.js
   ● Test suite failed to run
 
     banana
@@ -19,7 +19,7 @@ exports[`not throwing Error objects 2`] = `
 `;
 
 exports[`not throwing Error objects 3`] = `
-"FAIL __tests__/throw_object.test.js
+"FAIL __tests__/throwObject.test.js
   ● Test suite failed to run
 
     Error: No message was provided
@@ -28,7 +28,7 @@ exports[`not throwing Error objects 3`] = `
 `;
 
 exports[`not throwing Error objects 4`] = `
-"FAIL __tests__/assertion_count.test.js
+"FAIL __tests__/assertionCount.test.js
   .assertions()
     ✕ throws
     ✕ throws on redeclare of assertion count
@@ -50,7 +50,7 @@ exports[`not throwing Error objects 4`] = `
       15 | const redeclare = () => {
       16 |   expect.assertions(1);
 
-      at Object.toBeTruthy (__tests__/assertion_count.test.js:13:17)
+      at Object.toBeTruthy (__tests__/assertionCount.test.js:13:17)
 
   ● .assertions() › throws
 
@@ -66,7 +66,7 @@ exports[`not throwing Error objects 4`] = `
       14 | };
       15 | const redeclare = () => {
 
-      at Object.assertions (__tests__/assertion_count.test.js:12:10)
+      at Object.assertions (__tests__/assertionCount.test.js:12:10)
 
   ● .assertions() › throws on redeclare of assertion count
 
@@ -82,7 +82,7 @@ exports[`not throwing Error objects 4`] = `
       19 | };
       20 | 
 
-      at Object.toBeTruthy (__tests__/assertion_count.test.js:17:17)
+      at Object.toBeTruthy (__tests__/assertionCount.test.js:17:17)
 
   ● .assertions() › throws on assertion
 
@@ -98,7 +98,7 @@ exports[`not throwing Error objects 4`] = `
       24 | };
       25 | 
 
-      at Object.assertions (__tests__/assertion_count.test.js:22:10)
+      at Object.assertions (__tests__/assertionCount.test.js:22:10)
 
   ● .hasAssertions() › throws when there are not assertions
 
@@ -114,13 +114,13 @@ exports[`not throwing Error objects 4`] = `
       29 | 
       30 | describe('.assertions()', () => {
 
-      at Object.hasAssertions (__tests__/assertion_count.test.js:27:10)
+      at Object.hasAssertions (__tests__/assertionCount.test.js:27:10)
 
 "
 `;
 
 exports[`not throwing Error objects 5`] = `
-"FAIL __tests__/during_tests.test.js
+"FAIL __tests__/duringTests.test.js
   ✕ Promise thrown during test
   ✕ Boolean thrown during test
   ✕ undefined thrown during test
@@ -142,7 +142,7 @@ exports[`not throwing Error objects 5`] = `
       11 | });
       12 | 
 
-      at Object.test (__tests__/during_tests.test.js:9:1)
+      at Object.test (__tests__/duringTests.test.js:9:1)
 
   ● Boolean thrown during test
 
@@ -156,7 +156,7 @@ exports[`not throwing Error objects 5`] = `
       15 |   throw false;
       16 | });
 
-      at Object.test (__tests__/during_tests.test.js:13:1)
+      at Object.test (__tests__/duringTests.test.js:13:1)
 
   ● undefined thrown during test
 
@@ -170,7 +170,7 @@ exports[`not throwing Error objects 5`] = `
       20 |   throw undefined;
       21 | });
 
-      at Object.test (__tests__/during_tests.test.js:18:1)
+      at Object.test (__tests__/duringTests.test.js:18:1)
 
   ● Object thrown during test
 
@@ -191,7 +191,7 @@ exports[`not throwing Error objects 5`] = `
       25 |   throw deepObject;
       26 | });
 
-      at Object.test (__tests__/during_tests.test.js:23:1)
+      at Object.test (__tests__/duringTests.test.js:23:1)
 
   ● Error during test
 
@@ -205,7 +205,7 @@ exports[`not throwing Error objects 5`] = `
       32 | 
       33 | test('done(Error)', done => {
 
-      at Object.doesNotExist (__tests__/during_tests.test.js:30:3)
+      at Object.doesNotExist (__tests__/duringTests.test.js:30:3)
 
   ● done(Error)
 
@@ -219,7 +219,7 @@ exports[`not throwing Error objects 5`] = `
       36 | 
       37 | test('done(non-error)', done => {
 
-      at Object.<anonymous>.done (__tests__/during_tests.test.js:34:8)
+      at Object.<anonymous>.done (__tests__/duringTests.test.js:34:8)
 
   ● done(non-error)
 
@@ -240,7 +240,7 @@ exports[`not throwing Error objects 5`] = `
       40 | 
       41 | test('returned promise rejection', () => Promise.reject(deepObject));
 
-      at Object.done (__tests__/during_tests.test.js:38:3)
+      at Object.done (__tests__/duringTests.test.js:38:3)
 
   ● returned promise rejection
 
@@ -259,13 +259,13 @@ exports[`not throwing Error objects 5`] = `
          | ^
       42 | 
 
-      at Object.test (__tests__/during_tests.test.js:41:1)
+      at Object.test (__tests__/duringTests.test.js:41:1)
 
 "
 `;
 
 exports[`works with assertions in separate files 1`] = `
-"FAIL __tests__/test_macro.test.js
+"FAIL __tests__/testMacro.test.js
   ✕ use some imported macro to make assertion
 
   ● use some imported macro to make assertion
@@ -283,13 +283,13 @@ exports[`works with assertions in separate files 1`] = `
       14 | 
 
       at toEqual (macros.js:12:15)
-      at Object.shouldEqual (__tests__/test_macro.test.js:14:3)
+      at Object.shouldEqual (__tests__/testMacro.test.js:14:3)
 
 "
 `;
 
 exports[`works with async failures 1`] = `
-"FAIL __tests__/async_failures.test.js
+"FAIL __tests__/asyncFailures.test.js
   ✕ resolve, but fail
   ✕ reject, but fail
   ✕ expect reject
@@ -318,7 +318,7 @@ exports[`works with async failures 1`] = `
       14 | test('reject, but fail', () =>
       15 |   expect(Promise.reject({foo: 'bar'})).rejects.toEqual({baz: 'bar'}));
 
-      at Object.toEqual (__tests__/async_failures.test.js:12:50)
+      at Object.toEqual (__tests__/asyncFailures.test.js:12:50)
 
   ● reject, but fail
 
@@ -342,7 +342,7 @@ exports[`works with async failures 1`] = `
       17 | test('expect reject', () =>
       18 |   expect(Promise.resolve({foo: 'bar'})).rejects.toEqual({foo: 'bar'}));
 
-      at Object.toEqual (__tests__/async_failures.test.js:15:48)
+      at Object.toEqual (__tests__/asyncFailures.test.js:15:48)
 
   ● expect reject
 
@@ -359,7 +359,7 @@ exports[`works with async failures 1`] = `
       20 | test('expect resolve', () =>
       21 |   expect(Promise.reject({foo: 'bar'})).resolves.toEqual({foo: 'bar'}));
 
-      at Object.expect (__tests__/async_failures.test.js:18:3)
+      at Object.expect (__tests__/asyncFailures.test.js:18:3)
 
   ● expect resolve
 
@@ -376,7 +376,7 @@ exports[`works with async failures 1`] = `
       23 | test('timeout', done => {
       24 |   setTimeout(done, 50);
 
-      at Object.expect (__tests__/async_failures.test.js:21:3)
+      at Object.expect (__tests__/asyncFailures.test.js:21:3)
 
   ● timeout
 
@@ -390,13 +390,13 @@ exports[`works with async failures 1`] = `
       25 | }, 5);
       26 | 
 
-      at Object.test (__tests__/async_failures.test.js:23:1)
+      at Object.test (__tests__/asyncFailures.test.js:23:1)
 
 "
 `;
 
 exports[`works with named snapshot failures 1`] = `
-"FAIL __tests__/snapshot_named.test.js
+"FAIL __tests__/snapshotNamed.test.js
   ✕ failing named snapshot
 
   ● failing named snapshot
@@ -418,14 +418,14 @@ exports[`works with named snapshot failures 1`] = `
       13 | });
       14 | 
 
-      at Object.toMatchSnapshot (__tests__/snapshot_named.test.js:12:17)
+      at Object.toMatchSnapshot (__tests__/snapshotNamed.test.js:12:17)
 
  › 1 snapshot failed.
 "
 `;
 
 exports[`works with node assert 1`] = `
-"FAIL __tests__/node_assertion_error.test.js
+"FAIL __tests__/assertionError.test.js
   ✕ assert
   ✕ assert with a message
   ✕ assert.ok
@@ -461,7 +461,7 @@ exports[`works with node assert 1`] = `
       17 | 
       18 | test('assert with a message', () => {
 
-      at Object.assert (__tests__/node_assertion_error.test.js:15:3)
+      at Object.assert (__tests__/assertionError.test.js:15:3)
 
   ● assert with a message
 
@@ -483,7 +483,7 @@ exports[`works with node assert 1`] = `
       21 | 
       22 | test('assert.ok', () => {
 
-      at Object.assert (__tests__/node_assertion_error.test.js:19:3)
+      at Object.assert (__tests__/assertionError.test.js:19:3)
 
   ● assert.ok
 
@@ -502,7 +502,7 @@ exports[`works with node assert 1`] = `
       25 | 
       26 | test('assert.ok with a message', () => {
 
-      at Object.ok (__tests__/node_assertion_error.test.js:23:10)
+      at Object.ok (__tests__/assertionError.test.js:23:10)
 
   ● assert.ok with a message
 
@@ -524,7 +524,7 @@ exports[`works with node assert 1`] = `
       29 | 
       30 | test('assert.equal', () => {
 
-      at Object.ok (__tests__/node_assertion_error.test.js:27:10)
+      at Object.ok (__tests__/assertionError.test.js:27:10)
 
   ● assert.equal
 
@@ -543,7 +543,7 @@ exports[`works with node assert 1`] = `
       33 | 
       34 | test('assert.notEqual', () => {
 
-      at Object.equal (__tests__/node_assertion_error.test.js:31:10)
+      at Object.equal (__tests__/assertionError.test.js:31:10)
 
   ● assert.notEqual
 
@@ -566,7 +566,7 @@ exports[`works with node assert 1`] = `
       37 | 
       38 | test('assert.deepEqual', () => {
 
-      at Object.notEqual (__tests__/node_assertion_error.test.js:35:10)
+      at Object.notEqual (__tests__/assertionError.test.js:35:10)
 
   ● assert.deepEqual
 
@@ -599,7 +599,7 @@ exports[`works with node assert 1`] = `
       41 | 
       42 | test('assert.deepEqual with a message', () => {
 
-      at Object.deepEqual (__tests__/node_assertion_error.test.js:39:10)
+      at Object.deepEqual (__tests__/assertionError.test.js:39:10)
 
   ● assert.deepEqual with a message
 
@@ -635,7 +635,7 @@ exports[`works with node assert 1`] = `
       45 | 
       46 | test('assert.notDeepEqual', () => {
 
-      at Object.deepEqual (__tests__/node_assertion_error.test.js:43:10)
+      at Object.deepEqual (__tests__/assertionError.test.js:43:10)
 
   ● assert.notDeepEqual
 
@@ -658,7 +658,7 @@ exports[`works with node assert 1`] = `
       49 | 
       50 | test('assert.strictEqual', () => {
 
-      at Object.notDeepEqual (__tests__/node_assertion_error.test.js:47:10)
+      at Object.notDeepEqual (__tests__/assertionError.test.js:47:10)
 
   ● assert.strictEqual
 
@@ -677,7 +677,7 @@ exports[`works with node assert 1`] = `
       53 | 
       54 | test('assert.notStrictEqual', () => {
 
-      at Object.strictEqual (__tests__/node_assertion_error.test.js:51:10)
+      at Object.strictEqual (__tests__/assertionError.test.js:51:10)
 
   ● assert.notStrictEqual
 
@@ -703,7 +703,7 @@ exports[`works with node assert 1`] = `
       57 | 
       58 | test('assert.deepStrictEqual', () => {
 
-      at Object.notStrictEqual (__tests__/node_assertion_error.test.js:55:10)
+      at Object.notStrictEqual (__tests__/assertionError.test.js:55:10)
 
   ● assert.deepStrictEqual
 
@@ -732,7 +732,7 @@ exports[`works with node assert 1`] = `
       61 | 
       62 | test('assert.notDeepStrictEqual', () => {
 
-      at Object.deepStrictEqual (__tests__/node_assertion_error.test.js:59:10)
+      at Object.deepStrictEqual (__tests__/assertionError.test.js:59:10)
 
   ● assert.notDeepStrictEqual
 
@@ -755,7 +755,7 @@ exports[`works with node assert 1`] = `
       65 | 
       66 | test('assert.ifError', () => {
 
-      at Object.notDeepStrictEqual (__tests__/node_assertion_error.test.js:63:10)
+      at Object.notDeepStrictEqual (__tests__/assertionError.test.js:63:10)
 
   ● assert.ifError
 
@@ -778,7 +778,7 @@ exports[`works with node assert 1`] = `
       73 |   });
       74 | });
 
-      at Object.doesNotThrow (__tests__/node_assertion_error.test.js:71:10)
+      at Object.doesNotThrow (__tests__/assertionError.test.js:71:10)
 
   ● assert.throws
 
@@ -798,7 +798,7 @@ exports[`works with node assert 1`] = `
       79 | 
       80 | test('async', async () => {
 
-      at Object.throws (__tests__/node_assertion_error.test.js:77:10)
+      at Object.throws (__tests__/assertionError.test.js:77:10)
 
   ● async
 
@@ -828,11 +828,11 @@ exports[`works with node assert 1`] = `
       82 | });
       83 | 
 
-      at Object.equal (__tests__/node_assertion_error.test.js:81:10)
-      at asyncGeneratorStep (__tests__/node_assertion_error.test.js:11:103)
-      at _next (__tests__/node_assertion_error.test.js:13:194)
-      at __tests__/node_assertion_error.test.js:13:364
-      at Object.<anonymous> (__tests__/node_assertion_error.test.js:13:97)
+      at Object.equal (__tests__/assertionError.test.js:81:10)
+      at asyncGeneratorStep (__tests__/assertionError.test.js:11:103)
+      at _next (__tests__/assertionError.test.js:13:194)
+      at __tests__/assertionError.test.js:13:364
+      at Object.<anonymous> (__tests__/assertionError.test.js:13:97)
 
 "
 `;
diff --git a/e2e/__tests__/__snapshots__/find_related_files.test.js.snap b/e2e/__tests__/__snapshots__/findRelatedFiles.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/find_related_files.test.js.snap
rename to e2e/__tests__/__snapshots__/findRelatedFiles.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/globals.test.js.snap b/e2e/__tests__/__snapshots__/globals.test.js.snap
index 6d7d7af67850..be32c136475a 100644
--- a/e2e/__tests__/__snapshots__/globals.test.js.snap
+++ b/e2e/__tests__/__snapshots__/globals.test.js.snap
@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`basic test constructs 1`] = `
-"PASS __tests__/basic.test-constructs.test.js
+"PASS __tests__/basic.testConstructs.test.js
   ✓ it
   ✓ test
   describe
@@ -20,7 +20,7 @@ Ran all test suites."
 `;
 
 exports[`cannot have describe with no implementation 1`] = `
-"FAIL __tests__/only-constructs.test.js
+"FAIL __tests__/onlyConstructs.test.js
   ● Test suite failed to run
 
     Missing second argument. It must be a callback function.
@@ -30,7 +30,7 @@ exports[`cannot have describe with no implementation 1`] = `
         |              ^
       3 |   
 
-      at Object.<anonymous> (__tests__/only-constructs.test.js:2:14)
+      at Object.<anonymous> (__tests__/onlyConstructs.test.js:2:14)
 
 "
 `;
@@ -45,7 +45,7 @@ Ran all test suites.
 `;
 
 exports[`cannot test with no implementation 1`] = `
-"FAIL __tests__/only-constructs.test.js
+"FAIL __tests__/onlyConstructs.test.js
   ● Test suite failed to run
 
     Missing second argument. It must be a callback function. Perhaps you want to use \`test.todo\` for a test placeholder.
@@ -57,7 +57,7 @@ exports[`cannot test with no implementation 1`] = `
       4 |     test('test, no implementation');
       5 |   
 
-      at Object.it (__tests__/only-constructs.test.js:3:5)
+      at Object.it (__tests__/onlyConstructs.test.js:3:5)
 
 "
 `;
@@ -72,7 +72,7 @@ Ran all test suites.
 `;
 
 exports[`cannot test with no implementation with expand arg 1`] = `
-"FAIL __tests__/only-constructs.test.js
+"FAIL __tests__/onlyConstructs.test.js
   ● Test suite failed to run
 
     Missing second argument. It must be a callback function. Perhaps you want to use \`test.todo\` for a test placeholder.
@@ -84,7 +84,7 @@ exports[`cannot test with no implementation with expand arg 1`] = `
       4 |     test('test, no implementation');
       5 |   
 
-      at Object.it (__tests__/only-constructs.test.js:3:5)
+      at Object.it (__tests__/onlyConstructs.test.js:3:5)
 
 "
 `;
@@ -99,7 +99,7 @@ Ran all test suites.
 `;
 
 exports[`function as descriptor 1`] = `
-"PASS __tests__/function-as-descriptor.test.js
+"PASS __tests__/functionAsDescriptor.test.js
   Foo
     ✓ it
 
@@ -115,7 +115,7 @@ Ran all test suites."
 `;
 
 exports[`only 1`] = `
-"PASS __tests__/only-constructs.test.js
+"PASS __tests__/onlyConstructs.test.js
   ✓ test.only
   ✓ it.only
   ✓ fit
@@ -140,7 +140,7 @@ Ran all test suites."
 `;
 
 exports[`only with expand arg 1`] = `
-"PASS __tests__/only-constructs.test.js
+"PASS __tests__/onlyConstructs.test.js
   ○ it
   ✓ test.only
   ✓ it.only
@@ -165,7 +165,7 @@ Ran all test suites."
 `;
 
 exports[`skips 1`] = `
-"PASS __tests__/skips-constructs.test.js
+"PASS __tests__/skipsConstructs.test.js
   ✓ it
   ○ skipped 4 tests
   xdescribe
@@ -187,7 +187,7 @@ Ran all test suites."
 `;
 
 exports[`skips with expand arg 1`] = `
-"PASS __tests__/skips-constructs.test.js
+"PASS __tests__/skipsConstructs.test.js
   ✓ it
   ○ xtest
   ○ xit
diff --git a/e2e/__tests__/__snapshots__/jest_changed_files.test.js.snap b/e2e/__tests__/__snapshots__/jestChangedFiles.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/jest_changed_files.test.js.snap
rename to e2e/__tests__/__snapshots__/jestChangedFiles.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/list_tests.test.js.snap b/e2e/__tests__/__snapshots__/listTests.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/list_tests.test.js.snap
rename to e2e/__tests__/__snapshots__/listTests.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/module_name_mapper.test.js.snap b/e2e/__tests__/__snapshots__/moduleNameMapper.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/module_name_mapper.test.js.snap
rename to e2e/__tests__/__snapshots__/moduleNameMapper.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/multi_project_runner.test.js.snap b/e2e/__tests__/__snapshots__/multiProjectRunner.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/multi_project_runner.test.js.snap
rename to e2e/__tests__/__snapshots__/multiProjectRunner.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/process_exit.test.js.snap b/e2e/__tests__/__snapshots__/processExit.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/process_exit.test.js.snap
rename to e2e/__tests__/__snapshots__/processExit.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/require_after_teardown.test.js.snap b/e2e/__tests__/__snapshots__/requireAfterTeardown.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/require_after_teardown.test.js.snap
rename to e2e/__tests__/__snapshots__/requireAfterTeardown.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/resolve_no_file_extensions.test.js.snap b/e2e/__tests__/__snapshots__/resolveNoFileExtensions.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/resolve_no_file_extensions.test.js.snap
rename to e2e/__tests__/__snapshots__/resolveNoFileExtensions.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/show_config.test.js.snap b/e2e/__tests__/__snapshots__/showConfig.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/show_config.test.js.snap
rename to e2e/__tests__/__snapshots__/showConfig.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/snapshot.test.js.snap b/e2e/__tests__/__snapshots__/snapshot.test.js.snap
index 7d07b4330396..4affd8faa05e 100644
--- a/e2e/__tests__/__snapshots__/snapshot.test.js.snap
+++ b/e2e/__tests__/__snapshots__/snapshot.test.js.snap
@@ -110,7 +110,7 @@ exports[`Snapshot works with escaped regex 1`] = `
 Tests:       2 passed, 2 total
 Snapshots:   2 written, 2 total
 Time:        <<REPLACED>>
-Ran all test suites matching /snapshot_escape_regex.js/i."
+Ran all test suites matching /snapshotEscapeRegex.js/i."
 `;
 
 exports[`Snapshot works with escaped regex 2`] = `
@@ -118,7 +118,7 @@ exports[`Snapshot works with escaped regex 2`] = `
 Tests:       2 passed, 2 total
 Snapshots:   2 passed, 2 total
 Time:        <<REPLACED>>
-Ran all test suites matching /snapshot_escape_regex.js/i."
+Ran all test suites matching /snapshotEscapeRegex.js/i."
 `;
 
 exports[`Snapshot works with template literal substitutions 1`] = `
@@ -126,7 +126,7 @@ exports[`Snapshot works with template literal substitutions 1`] = `
 Tests:       1 passed, 1 total
 Snapshots:   1 written, 1 total
 Time:        <<REPLACED>>
-Ran all test suites matching /snapshot_escape_substitution.test.js/i."
+Ran all test suites matching /snapshotEscapeSubstitution.test.js/i."
 `;
 
 exports[`Snapshot works with template literal substitutions 2`] = `
@@ -134,5 +134,5 @@ exports[`Snapshot works with template literal substitutions 2`] = `
 Tests:       1 passed, 1 total
 Snapshots:   1 passed, 1 total
 Time:        <<REPLACED>>
-Ran all test suites matching /snapshot_escape_substitution.test.js/i."
+Ran all test suites matching /snapshotEscapeSubstitution.test.js/i."
 `;
diff --git a/e2e/__tests__/__snapshots__/snapshot-mock-fs.test.js.snap b/e2e/__tests__/__snapshots__/snapshotMockFs.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/snapshot-mock-fs.test.js.snap
rename to e2e/__tests__/__snapshots__/snapshotMockFs.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/snapshot_serializers.test.js.snap b/e2e/__tests__/__snapshots__/snapshotSerializers.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/snapshot_serializers.test.js.snap
rename to e2e/__tests__/__snapshots__/snapshotSerializers.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/stack_trace.test.js.snap b/e2e/__tests__/__snapshots__/stackTrace.test.js.snap
similarity index 78%
rename from e2e/__tests__/__snapshots__/stack_trace.test.js.snap
rename to e2e/__tests__/__snapshots__/stackTrace.test.js.snap
index 0e8075de198a..c6f41c5d4735 100644
--- a/e2e/__tests__/__snapshots__/stack_trace.test.js.snap
+++ b/e2e/__tests__/__snapshots__/stackTrace.test.js.snap
@@ -5,7 +5,7 @@ exports[`Stack Trace does not print a stack trace for errors when --noStackTrace
 Tests:       3 failed, 3 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /test_error.test.js/i.
+Ran all test suites matching /testError.test.js/i.
 "
 `;
 
@@ -14,7 +14,7 @@ exports[`Stack Trace does not print a stack trace for matching errors when --noS
 Tests:       1 failed, 1 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /stack_trace.test.js/i.
+Ran all test suites matching /stackTrace.test.js/i.
 "
 `;
 
@@ -23,7 +23,7 @@ exports[`Stack Trace does not print a stack trace for runtime errors when --noSt
 Tests:       0 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /runtime_error.test.js/i.
+Ran all test suites matching /runtimeError.test.js/i.
 "
 `;
 
@@ -32,7 +32,7 @@ exports[`Stack Trace prints a stack trace for errors 1`] = `
 Tests:       3 failed, 3 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /test_error.test.js/i.
+Ran all test suites matching /testError.test.js/i.
 "
 `;
 
@@ -41,7 +41,7 @@ exports[`Stack Trace prints a stack trace for errors without message in stack tr
 Tests:       1 failed, 1 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /stack_trace_without_message.test.js/i.
+Ran all test suites matching /stackTraceWithoutMessage.test.js/i.
 "
 `;
 
@@ -50,7 +50,7 @@ exports[`Stack Trace prints a stack trace for matching errors 1`] = `
 Tests:       1 failed, 1 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /stack_trace.test.js/i.
+Ran all test suites matching /stackTrace.test.js/i.
 "
 `;
 
@@ -59,6 +59,6 @@ exports[`Stack Trace prints a stack trace for runtime errors 1`] = `
 Tests:       0 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
-Ran all test suites matching /runtime_error.test.js/i.
+Ran all test suites matching /runtimeError.test.js/i.
 "
 `;
diff --git a/e2e/__tests__/__snapshots__/test_name_pattern.test.js.snap b/e2e/__tests__/__snapshots__/testNamePattern.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/test_name_pattern.test.js.snap
rename to e2e/__tests__/__snapshots__/testNamePattern.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/test_name_pattern_skipped.test.js.snap b/e2e/__tests__/__snapshots__/testNamePatternSkipped.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/test_name_pattern_skipped.test.js.snap
rename to e2e/__tests__/__snapshots__/testNamePatternSkipped.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/test-todo.test.js.snap b/e2e/__tests__/__snapshots__/testTodo.test.js.snap
similarity index 80%
rename from e2e/__tests__/__snapshots__/test-todo.test.js.snap
rename to e2e/__tests__/__snapshots__/testTodo.test.js.snap
index 3eb148742200..504ca6f1b5f8 100644
--- a/e2e/__tests__/__snapshots__/test-todo.test.js.snap
+++ b/e2e/__tests__/__snapshots__/testTodo.test.js.snap
@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`shows error messages when called with invalid argument 1`] = `
-"FAIL __tests__/todo_non_string.test.js
+"FAIL __tests__/todoNonString.test.js
   ● Test suite failed to run
 
     Todo must be called with only a description.
@@ -12,13 +12,13 @@ exports[`shows error messages when called with invalid argument 1`] = `
         |    ^
       9 | 
 
-      at Object.todo (__tests__/todo_non_string.test.js:8:4)
+      at Object.todo (__tests__/todoNonString.test.js:8:4)
 
 "
 `;
 
 exports[`shows error messages when called with multiple arguments 1`] = `
-"FAIL __tests__/todo_multiple_args.test.js
+"FAIL __tests__/todoMultipleArgs.test.js
   ● Test suite failed to run
 
     Todo must be called with only a description.
@@ -29,13 +29,13 @@ exports[`shows error messages when called with multiple arguments 1`] = `
         |    ^
       9 | 
 
-      at Object.todo (__tests__/todo_multiple_args.test.js:8:4)
+      at Object.todo (__tests__/todoMultipleArgs.test.js:8:4)
 
 "
 `;
 
 exports[`shows error messages when called with no arguments 1`] = `
-"FAIL __tests__/todo_no_args.test.js
+"FAIL __tests__/todoNoArgs.test.js
   ● Test suite failed to run
 
     Todo must be called with only a description.
@@ -46,7 +46,7 @@ exports[`shows error messages when called with no arguments 1`] = `
         |    ^
       9 | 
 
-      at Object.todo (__tests__/todo_no_args.test.js:8:4)
+      at Object.todo (__tests__/todoNoArgs.test.js:8:4)
 
 "
 `;
diff --git a/e2e/__tests__/__snapshots__/timeouts_legacy.test.js.snap b/e2e/__tests__/__snapshots__/timeoutsLegacy.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/timeouts_legacy.test.js.snap
rename to e2e/__tests__/__snapshots__/timeoutsLegacy.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/to_match_inline_snapshot.test.js.snap b/e2e/__tests__/__snapshots__/toMatchInlineSnapshot.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/to_match_inline_snapshot.test.js.snap
rename to e2e/__tests__/__snapshots__/toMatchInlineSnapshot.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/to_throw_error_matching_inline_snapshot.test.js.snap b/e2e/__tests__/__snapshots__/toThrowErrorMatchingInlineSnapshot.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/to_throw_error_matching_inline_snapshot.test.js.snap
rename to e2e/__tests__/__snapshots__/toThrowErrorMatchingInlineSnapshot.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/to_throw_error_matching_snapshot.test.js.snap b/e2e/__tests__/__snapshots__/toThrowErrorMatchingSnapshot.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/to_throw_error_matching_snapshot.test.js.snap
rename to e2e/__tests__/__snapshots__/toThrowErrorMatchingSnapshot.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/transform.test.js.snap b/e2e/__tests__/__snapshots__/transform.test.js.snap
index 3189d30c87af..b6a57fc88c48 100644
--- a/e2e/__tests__/__snapshots__/transform.test.js.snap
+++ b/e2e/__tests__/__snapshots__/transform.test.js.snap
@@ -5,7 +5,7 @@ exports[`babel-jest instruments only specific files and collects coverage 1`] =
 File        |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
 ------------|----------|----------|----------|----------|-------------------|
 All files   |    83.33 |      100 |       50 |       80 |                   |
- Covered.js |    83.33 |      100 |       50 |       80 |                13 |
+ covered.js |    83.33 |      100 |       50 |       80 |                13 |
 ------------|----------|----------|----------|----------|-------------------|"
 `;
 
@@ -22,7 +22,7 @@ exports[`no babel-jest instrumentation with no babel-jest 1`] = `
 File        |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
 ------------|----------|----------|----------|----------|-------------------|
 All files   |    83.33 |      100 |       50 |       80 |                   |
- Covered.js |    83.33 |      100 |       50 |       80 |                13 |
+ covered.js |    83.33 |      100 |       50 |       80 |                13 |
 ------------|----------|----------|----------|----------|-------------------|
 "
 `;
diff --git a/e2e/__tests__/__snapshots__/typescript_coverage.test.js.snap b/e2e/__tests__/__snapshots__/typescriptCoverage.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/typescript_coverage.test.js.snap
rename to e2e/__tests__/__snapshots__/typescriptCoverage.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/watch_mode_only_failed.test.js.snap b/e2e/__tests__/__snapshots__/watchModeOnlyFailed.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/watch_mode_only_failed.test.js.snap
rename to e2e/__tests__/__snapshots__/watchModeOnlyFailed.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/watch_mode_patterns.test.js.snap b/e2e/__tests__/__snapshots__/watchModePatterns.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/watch_mode_patterns.test.js.snap
rename to e2e/__tests__/__snapshots__/watchModePatterns.test.js.snap
diff --git a/e2e/__tests__/__snapshots__/watch_mode_update_snapshot.test.js.snap b/e2e/__tests__/__snapshots__/watchModeUpdateSnapshot.test.js.snap
similarity index 100%
rename from e2e/__tests__/__snapshots__/watch_mode_update_snapshot.test.js.snap
rename to e2e/__tests__/__snapshots__/watchModeUpdateSnapshot.test.js.snap
diff --git a/e2e/__tests__/auto_clear_mocks.test.js b/e2e/__tests__/autoClearMocks.test.js
similarity index 100%
rename from e2e/__tests__/auto_clear_mocks.test.js
rename to e2e/__tests__/autoClearMocks.test.js
diff --git a/e2e/__tests__/auto_reset_mocks.test.js b/e2e/__tests__/autoResetMocks.test.js
similarity index 100%
rename from e2e/__tests__/auto_reset_mocks.test.js
rename to e2e/__tests__/autoResetMocks.test.js
diff --git a/e2e/__tests__/auto_restore_mocks.test.js b/e2e/__tests__/autoRestoreMocks.test.js
similarity index 100%
rename from e2e/__tests__/auto_restore_mocks.test.js
rename to e2e/__tests__/autoRestoreMocks.test.js
diff --git a/e2e/__tests__/babel_plugin_jest_hoist.test.js b/e2e/__tests__/babelPluginJestHoist.test.js
similarity index 100%
rename from e2e/__tests__/babel_plugin_jest_hoist.test.js
rename to e2e/__tests__/babelPluginJestHoist.test.js
diff --git a/e2e/__tests__/bad_source_map.test.js b/e2e/__tests__/badSourceMap.test.js
similarity index 100%
rename from e2e/__tests__/bad_source_map.test.js
rename to e2e/__tests__/badSourceMap.test.js
diff --git a/e2e/__tests__/before-all-filtered.js b/e2e/__tests__/beforeAllFiltered.js
similarity index 100%
rename from e2e/__tests__/before-all-filtered.js
rename to e2e/__tests__/beforeAllFiltered.js
diff --git a/e2e/__tests__/before-each-queue.js b/e2e/__tests__/beforeEachQueue.js
similarity index 100%
rename from e2e/__tests__/before-each-queue.js
rename to e2e/__tests__/beforeEachQueue.js
diff --git a/e2e/__tests__/clear_cache.test.js b/e2e/__tests__/clearCache.test.js
similarity index 100%
rename from e2e/__tests__/clear_cache.test.js
rename to e2e/__tests__/clearCache.test.js
diff --git a/e2e/__tests__/cli-handles-exact-filenames.test.js b/e2e/__tests__/cliHandlesExactFilenames.test.js
similarity index 100%
rename from e2e/__tests__/cli-handles-exact-filenames.test.js
rename to e2e/__tests__/cliHandlesExactFilenames.test.js
diff --git a/e2e/__tests__/compare_dom_nodes.test.js b/e2e/__tests__/compareDomNodes.test.js
similarity index 84%
rename from e2e/__tests__/compare_dom_nodes.test.js
rename to e2e/__tests__/compareDomNodes.test.js
index cef2c84928b3..e17e0d0d578f 100644
--- a/e2e/__tests__/compare_dom_nodes.test.js
+++ b/e2e/__tests__/compareDomNodes.test.js
@@ -13,5 +13,5 @@ import runJest from '../runJest';
 test('does not crash when expect involving a DOM node fails', () => {
   const result = runJest('compare-dom-nodes');
 
-  expect(result.stderr).toContain('FAIL __tests__/failed-assertion.js');
+  expect(result.stderr).toContain('FAIL __tests__/failedAssertion.js');
 });
diff --git a/e2e/__tests__/console_log_output_when_run_in_band.test.js b/e2e/__tests__/consoleLogOutputWhenRunInBand.test.js
similarity index 92%
rename from e2e/__tests__/console_log_output_when_run_in_band.test.js
rename to e2e/__tests__/consoleLogOutputWhenRunInBand.test.js
index fd443ead78c6..5f4412f68bbf 100644
--- a/e2e/__tests__/console_log_output_when_run_in_band.test.js
+++ b/e2e/__tests__/consoleLogOutputWhenRunInBand.test.js
@@ -13,7 +13,7 @@ import path from 'path';
 import {cleanup, extractSummary, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(__dirname, '../console_log_output_when_run_in_band');
+const DIR = path.resolve(__dirname, '../console-log-output-when-run-in-band');
 
 beforeEach(() => cleanup(DIR));
 afterAll(() => cleanup(DIR));
diff --git a/e2e/__tests__/coverage_remapping.test.js b/e2e/__tests__/coverageRemapping.test.js
similarity index 100%
rename from e2e/__tests__/coverage_remapping.test.js
rename to e2e/__tests__/coverageRemapping.test.js
diff --git a/e2e/__tests__/coverage_report.test.js b/e2e/__tests__/coverageReport.test.js
similarity index 96%
rename from e2e/__tests__/coverage_report.test.js
rename to e2e/__tests__/coverageReport.test.js
index 9cf395635b6a..9fab19fb0670 100644
--- a/e2e/__tests__/coverage_report.test.js
+++ b/e2e/__tests__/coverageReport.test.js
@@ -57,7 +57,7 @@ test('collects coverage only from multiple specified files', () => {
       '--collectCoverageFrom',
       'setup.js',
       '--collectCoverageFrom',
-      'OtherFile.js',
+      'otherFile.js',
     ],
     {stripAnsi: true},
   );
@@ -72,9 +72,9 @@ test('collects coverage only from specified files avoiding dependencies', () =>
       '--no-cache',
       '--coverage',
       '--collectCoverageOnlyFrom',
-      'Sum.js',
+      'sum.js',
       '--',
-      'Sum.test.js',
+      'sum.test.js',
     ],
     {stripAnsi: true},
   );
@@ -164,11 +164,11 @@ test('collects coverage from duplicate files avoiding shared cache', () => {
     '--coverageThreshold',
     '{"global": {"lines": 100}}',
     '--collectCoverageOnlyFrom',
-    'cached-duplicates/a/Identical.js',
+    'cached-duplicates/a/identical.js',
     '--collectCoverageOnlyFrom',
-    'cached-duplicates/b/Identical.js',
+    'cached-duplicates/b/identical.js',
     '--',
-    'Identical.test.js',
+    'identical.test.js',
   ];
   // Run once to prime the cache
   runJest(DIR, args, {stripAnsi: true});
diff --git a/e2e/__tests__/coverage_threshold.test.js b/e2e/__tests__/coverageThreshold.test.js
similarity index 100%
rename from e2e/__tests__/coverage_threshold.test.js
rename to e2e/__tests__/coverageThreshold.test.js
diff --git a/e2e/__tests__/coverage_transform_instrumented.test.js b/e2e/__tests__/coverageTransformInstrumented.test.js
similarity index 100%
rename from e2e/__tests__/coverage_transform_instrumented.test.js
rename to e2e/__tests__/coverageTransformInstrumented.test.js
diff --git a/e2e/__tests__/custom_matcher_stack_trace.test.js b/e2e/__tests__/customMatcherStackTrace.test.js
similarity index 100%
rename from e2e/__tests__/custom_matcher_stack_trace.test.js
rename to e2e/__tests__/customMatcherStackTrace.test.js
diff --git a/e2e/__tests__/custom_reporters.test.js b/e2e/__tests__/customReporters.test.js
similarity index 99%
rename from e2e/__tests__/custom_reporters.test.js
rename to e2e/__tests__/customReporters.test.js
index 0ba5c64c581a..0fba6b615965 100644
--- a/e2e/__tests__/custom_reporters.test.js
+++ b/e2e/__tests__/customReporters.test.js
@@ -97,7 +97,7 @@ describe('Custom Reporters Integration', () => {
 
   test('TestReporter with all tests failing', () => {
     const {stdout, status, stderr} = runJest('custom-reporters', [
-      'add_fail.test.js',
+      'addFail.test.js',
     ]);
 
     const parsedJSON = JSON.parse(stdout);
diff --git a/e2e/__tests__/custom-resolver.test.js b/e2e/__tests__/customResolver.test.js
similarity index 100%
rename from e2e/__tests__/custom-resolver.test.js
rename to e2e/__tests__/customResolver.test.js
diff --git a/e2e/__tests__/dependency_clash.test.js b/e2e/__tests__/dependencyClash.test.js
similarity index 100%
rename from e2e/__tests__/dependency_clash.test.js
rename to e2e/__tests__/dependencyClash.test.js
diff --git a/e2e/__tests__/deprecated_cli_options.test.js b/e2e/__tests__/deprecatedCliOptions.test.js
similarity index 100%
rename from e2e/__tests__/deprecated_cli_options.test.js
rename to e2e/__tests__/deprecatedCliOptions.test.js
diff --git a/e2e/__tests__/detect_open_handles.js b/e2e/__tests__/detectOpenHandles.js
similarity index 100%
rename from e2e/__tests__/detect_open_handles.js
rename to e2e/__tests__/detectOpenHandles.js
diff --git a/e2e/__tests__/each.test.js b/e2e/__tests__/each.test.js
index 5b743cce5420..f6ddda5d9ecd 100644
--- a/e2e/__tests__/each.test.js
+++ b/e2e/__tests__/each.test.js
@@ -21,7 +21,7 @@ test('works with passing tests', () => {
 });
 
 test('shows error message when not enough arguments are supplied to tests', () => {
-  const result = runJest(dir, ['each-exception.test.js']);
+  const result = runJest(dir, ['eachException.test.js']);
   expect(result.status).toBe(1);
   const {rest} = extractSummary(result.stderr);
   expect(rest).toMatchSnapshot();
@@ -38,21 +38,21 @@ test('shows the correct errors in stderr when failing tests', () => {
 });
 
 test('shows only the tests with .only as being ran', () => {
-  const result = runJest(dir, ['each-only.test.js']);
+  const result = runJest(dir, ['eachOnly.test.js']);
   expect(result.status).toBe(0);
   const {rest} = extractSummary(result.stderr);
   expect(rest).toMatchSnapshot();
 });
 
 test('shows only the tests without .skip as being ran', () => {
-  const result = runJest(dir, ['each-skip.test.js']);
+  const result = runJest(dir, ['eachSkip.test.js']);
   const {rest} = extractSummary(result.stderr);
   expect(rest).toMatchSnapshot();
   expect(result.status).toBe(0);
 });
 
 test('runs only the describe.only.each tests', () => {
-  const result = runJest(dir, ['describe-only.test.js']);
+  const result = runJest(dir, ['describeOnly.test.js']);
   const {rest} = extractSummary(result.stderr);
   expect(rest).toMatchSnapshot();
   expect(result.status).toBe(0);
diff --git a/e2e/__tests__/empty-describe-with-hooks.test.js b/e2e/__tests__/emptyDescribeWithHooks.test.js
similarity index 79%
rename from e2e/__tests__/empty-describe-with-hooks.test.js
rename to e2e/__tests__/emptyDescribeWithHooks.test.js
index b8876fb79d51..a20c8e8c8a0e 100644
--- a/e2e/__tests__/empty-describe-with-hooks.test.js
+++ b/e2e/__tests__/emptyDescribeWithHooks.test.js
@@ -19,25 +19,25 @@ const dir = path.resolve(__dirname, '../empty-describe-with-hooks');
 skipSuiteOnJasmine();
 
 test('hook in empty describe', () => {
-  const result = runJest(dir, ['hook-in-empty-describe.test.js']);
+  const result = runJest(dir, ['hookInEmptyDescribe.test.js']);
   expect(result.status).toBe(1);
   expect(extractSummary(result.stderr)).toMatchSnapshot();
 });
 
 test('hook in describe with skipped test', () => {
-  const result = runJest(dir, ['hook-in-describe-with-skipped-test.test.js']);
+  const result = runJest(dir, ['hookInDescribeWithSkippedTest.test.js']);
   expect(result.status).toBe(0);
   expect(extractSummary(result.stderr)).toMatchSnapshot();
 });
 
 test('hook in empty nested describe', () => {
-  const result = runJest(dir, ['hook-in-empty-nested-describe.test.js']);
+  const result = runJest(dir, ['hookInEmptyNestedDescribe.test.js']);
   expect(result.status).toBe(1);
   expect(extractSummary(result.stderr)).toMatchSnapshot();
 });
 
 test('multiple hooks in empty describe', () => {
-  const result = runJest(dir, ['multiple-hooks-in-empty-describe.test.js']);
+  const result = runJest(dir, ['multipleHooksInEmptyDescribe.test.js']);
   expect(result.status).toBe(1);
   expect(extractSummary(result.stderr)).toMatchSnapshot();
 });
diff --git a/e2e/__tests__/empty_suite_error.test.js b/e2e/__tests__/emptySuiteError.test.js
similarity index 100%
rename from e2e/__tests__/empty_suite_error.test.js
rename to e2e/__tests__/emptySuiteError.test.js
diff --git a/e2e/__tests__/error-on-deprecated.test.js b/e2e/__tests__/errorOnDeprecated.test.js
similarity index 97%
rename from e2e/__tests__/error-on-deprecated.test.js
rename to e2e/__tests__/errorOnDeprecated.test.js
index 94ab728d384b..b341dea25140 100644
--- a/e2e/__tests__/error-on-deprecated.test.js
+++ b/e2e/__tests__/errorOnDeprecated.test.js
@@ -26,7 +26,7 @@ const testFiles = [
   'pending.test.js',
   'spyOn.test.js',
   'spyOnProperty.test.js',
-  'DEFAULT_TIMEOUT_INTERVAL.test.js',
+  'defaultTimeoutInterval.test.js',
 ];
 
 const SHOULD_NOT_PASS_IN_JEST = new Set([
diff --git a/e2e/__tests__/execute-tests-once-in-mpr.js b/e2e/__tests__/executeTestsOnceInMpr.js
similarity index 100%
rename from e2e/__tests__/execute-tests-once-in-mpr.js
rename to e2e/__tests__/executeTestsOnceInMpr.js
diff --git a/e2e/__tests__/expect-async-matcher.test.js b/e2e/__tests__/expectAsyncMatcher.test.js
similarity index 100%
rename from e2e/__tests__/expect-async-matcher.test.js
rename to e2e/__tests__/expectAsyncMatcher.test.js
diff --git a/e2e/__tests__/expect_in_vm.test.js b/e2e/__tests__/expectInVm.test.js
similarity index 100%
rename from e2e/__tests__/expect_in_vm.test.js
rename to e2e/__tests__/expectInVm.test.js
diff --git a/e2e/__tests__/failures.test.js b/e2e/__tests__/failures.test.js
index 3e630c2ef399..088248ca76fb 100644
--- a/e2e/__tests__/failures.test.js
+++ b/e2e/__tests__/failures.test.js
@@ -24,21 +24,21 @@ function cleanStderr(stderr) {
 
 test('not throwing Error objects', () => {
   let stderr;
-  stderr = runJest(dir, ['throw_number.test.js']).stderr;
+  stderr = runJest(dir, ['throwNumber.test.js']).stderr;
   expect(cleanStderr(stderr)).toMatchSnapshot();
-  stderr = runJest(dir, ['throw_string.test.js']).stderr;
+  stderr = runJest(dir, ['throwString.test.js']).stderr;
   expect(cleanStderr(stderr)).toMatchSnapshot();
-  stderr = runJest(dir, ['throw_object.test.js']).stderr;
+  stderr = runJest(dir, ['throwObject.test.js']).stderr;
   expect(cleanStderr(stderr)).toMatchSnapshot();
-  stderr = runJest(dir, ['assertion_count.test.js']).stderr;
+  stderr = runJest(dir, ['assertionCount.test.js']).stderr;
   expect(cleanStderr(stderr)).toMatchSnapshot();
-  stderr = runJest(dir, ['during_tests.test.js']).stderr;
+  stderr = runJest(dir, ['duringTests.test.js']).stderr;
   expect(cleanStderr(stderr)).toMatchSnapshot();
 });
 
 test('works with node assert', () => {
   const nodeMajorVersion = Number(process.versions.node.split('.')[0]);
-  const {stderr} = runJest(dir, ['node_assertion_error.test.js']);
+  const {stderr} = runJest(dir, ['assertionError.test.js']);
   let summary = normalizeDots(cleanStderr(stderr));
 
   // Node 9 started to include the error for `doesNotThrow`
@@ -64,7 +64,7 @@ test('works with node assert', () => {
       73 |   });
       74 | });
 
-      at Object.doesNotThrow (__tests__/node_assertion_error.test.js:71:10)
+      at Object.doesNotThrow (__tests__/assertionError.test.js:71:10)
 `);
 
     const commonErrorMessage = `Message:
@@ -114,7 +114,7 @@ test('works with node assert', () => {
       69 | 
       70 | test('assert.doesNotThrow', () => {
 
-      at Object.ifError (__tests__/node_assertion_error.test.js:67:10)
+      at Object.ifError (__tests__/assertionError.test.js:67:10)
 `;
 
     expect(summary).toContain(ifErrorMessage);
@@ -131,7 +131,7 @@ test('works with node assert', () => {
       68 | });
       69 | 
 
-      at Object.test (__tests__/node_assertion_error.test.js:66:1)
+      at Object.test (__tests__/assertionError.test.js:66:1)
 `;
 
     expect(summary).toContain(ifErrorMessage);
@@ -142,13 +142,13 @@ test('works with node assert', () => {
 });
 
 test('works with assertions in separate files', () => {
-  const {stderr} = runJest(dir, ['test_macro.test.js']);
+  const {stderr} = runJest(dir, ['testMacro.test.js']);
 
   expect(normalizeDots(cleanStderr(stderr))).toMatchSnapshot();
 });
 
 test('works with async failures', () => {
-  const {stderr} = runJest(dir, ['async_failures.test.js']);
+  const {stderr} = runJest(dir, ['asyncFailures.test.js']);
 
   const rest = cleanStderr(stderr)
     .split('\n')
@@ -175,7 +175,7 @@ test('works with snapshot failures', () => {
 });
 
 test('works with named snapshot failures', () => {
-  const {stderr} = runJest(dir, ['snapshot_named.test.js']);
+  const {stderr} = runJest(dir, ['snapshotNamed.test.js']);
 
   const result = normalizeDots(cleanStderr(stderr));
 
diff --git a/e2e/__tests__/fake-promises.test.js b/e2e/__tests__/fakePromises.test.js
similarity index 100%
rename from e2e/__tests__/fake-promises.test.js
rename to e2e/__tests__/fakePromises.test.js
diff --git a/e2e/__tests__/find_related_files.test.js b/e2e/__tests__/findRelatedFiles.test.js
similarity index 98%
rename from e2e/__tests__/find_related_files.test.js
rename to e2e/__tests__/findRelatedFiles.test.js
index 479626847cb0..98fa91b5523f 100644
--- a/e2e/__tests__/find_related_files.test.js
+++ b/e2e/__tests__/findRelatedFiles.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import path from 'path';
 import {cleanup, extractSummary, writeFiles} from '../Utils';
 
-const DIR = path.resolve(os.tmpdir(), 'find_related_tests_test');
+const DIR = path.resolve(os.tmpdir(), 'find-related-tests-test');
 
 beforeEach(() => cleanup(DIR));
 afterEach(() => cleanup(DIR));
diff --git a/e2e/__tests__/force_exit.test.js b/e2e/__tests__/forceExit.test.js
similarity index 95%
rename from e2e/__tests__/force_exit.test.js
rename to e2e/__tests__/forceExit.test.js
index ed0ec2ea0646..11179a316c5e 100644
--- a/e2e/__tests__/force_exit.test.js
+++ b/e2e/__tests__/forceExit.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import path from 'path';
 import {cleanup, writeFiles} from '../Utils';
 
-const DIR = path.resolve(os.tmpdir(), 'force_exit_test');
+const DIR = path.resolve(os.tmpdir(), 'force-exit-test');
 
 beforeEach(() => cleanup(DIR));
 afterEach(() => cleanup(DIR));
diff --git a/e2e/__tests__/generator_mock.test.js b/e2e/__tests__/generatorMock.test.js
similarity index 100%
rename from e2e/__tests__/generator_mock.test.js
rename to e2e/__tests__/generatorMock.test.js
diff --git a/e2e/__tests__/global_setup.test.js b/e2e/__tests__/globalSetup.test.js
similarity index 97%
rename from e2e/__tests__/global_setup.test.js
rename to e2e/__tests__/globalSetup.test.js
index 74ad525423b4..44b409f6f0b4 100644
--- a/e2e/__tests__/global_setup.test.js
+++ b/e2e/__tests__/globalSetup.test.js
@@ -43,7 +43,7 @@ test('globalSetup is triggered once before all test suites', () => {
 });
 
 test('jest throws an error when globalSetup does not export a function', () => {
-  const setupPath = path.resolve(__dirname, '../global-setup/invalid_setup.js');
+  const setupPath = path.resolve(__dirname, '../global-setup/invalidSetup.js');
   const {status, stderr} = runJest('global-setup', [
     `--globalSetup=${setupPath}`,
     `--testPathPattern=__tests__`,
@@ -58,7 +58,7 @@ test('jest throws an error when globalSetup does not export a function', () => {
 test('globalSetup function gets jest config object as a parameter', () => {
   const setupPath = path.resolve(
     __dirname,
-    '../global-setup/setup-with-config.js',
+    '../global-setup/setupWithConfig.js',
   );
 
   const testPathPattern = 'pass';
diff --git a/e2e/__tests__/global_teardown.test.js b/e2e/__tests__/globalTeardown.test.js
similarity index 96%
rename from e2e/__tests__/global_teardown.test.js
rename to e2e/__tests__/globalTeardown.test.js
index f510313dd8df..8f776ae30e8e 100644
--- a/e2e/__tests__/global_teardown.test.js
+++ b/e2e/__tests__/globalTeardown.test.js
@@ -50,7 +50,7 @@ test('globalTeardown is triggered once after all test suites', () => {
 test('jest throws an error when globalTeardown does not export a function', () => {
   const teardownPath = path.resolve(
     __dirname,
-    '../global-teardown/invalid_teardown.js',
+    '../global-teardown/invalidTeardown.js',
   );
   const {status, stderr} = runJest('global-teardown', [
     `--globalTeardown=${teardownPath}`,
@@ -66,7 +66,7 @@ test('jest throws an error when globalTeardown does not export a function', () =
 test('globalTeardown function gets jest config object as a parameter', () => {
   const teardownPath = path.resolve(
     __dirname,
-    '../global-teardown/teardown-with-config.js',
+    '../global-teardown/teardownWithConfig.js',
   );
 
   const testPathPattern = 'pass';
diff --git a/e2e/__tests__/globals.test.js b/e2e/__tests__/globals.test.js
index c2c6361c8f63..0a60e99d6b8d 100644
--- a/e2e/__tests__/globals.test.js
+++ b/e2e/__tests__/globals.test.js
@@ -19,7 +19,7 @@ import {
   writeFiles,
 } from '../Utils';
 
-const DIR = path.resolve(os.tmpdir(), 'global-variables.test');
+const DIR = path.resolve(os.tmpdir(), 'globalVariables.test');
 const TEST_DIR = path.resolve(DIR, '__tests__');
 
 function cleanStderr(stderr) {
@@ -35,7 +35,7 @@ beforeEach(() => {
 afterAll(() => cleanup(DIR));
 
 test('basic test constructs', () => {
-  const filename = 'basic.test-constructs.test.js';
+  const filename = 'basic.testConstructs.test.js';
   const content = `
     it('it', () => {});
     test('test', () => {});
@@ -56,7 +56,7 @@ test('basic test constructs', () => {
 });
 
 test('skips', () => {
-  const filename = 'skips-constructs.test.js';
+  const filename = 'skipsConstructs.test.js';
   const content = `
     it('it', () => {});
     xtest('xtest', () => {});
@@ -87,7 +87,7 @@ test('skips', () => {
 });
 
 test('only', () => {
-  const filename = 'only-constructs.test.js';
+  const filename = 'onlyConstructs.test.js';
   const content = `
     it('it', () => {});
     test.only('test.only', () => {});
@@ -117,7 +117,7 @@ test('only', () => {
 });
 
 test('cannot have describe with no implementation', () => {
-  const filename = 'only-constructs.test.js';
+  const filename = 'onlyConstructs.test.js';
   const content = `
     describe('describe, no implementation');
   `;
@@ -133,7 +133,7 @@ test('cannot have describe with no implementation', () => {
 });
 
 test('cannot test with no implementation', () => {
-  const filename = 'only-constructs.test.js';
+  const filename = 'onlyConstructs.test.js';
   const content = `
     it('it', () => {});
     it('it, no implementation');
@@ -150,7 +150,7 @@ test('cannot test with no implementation', () => {
 });
 
 test('skips with expand arg', () => {
-  const filename = 'skips-constructs.test.js';
+  const filename = 'skipsConstructs.test.js';
   const content = `
     it('it', () => {});
     xtest('xtest', () => {});
@@ -181,7 +181,7 @@ test('skips with expand arg', () => {
 });
 
 test('only with expand arg', () => {
-  const filename = 'only-constructs.test.js';
+  const filename = 'onlyConstructs.test.js';
   const content = `
     it('it', () => {});
     test.only('test.only', () => {});
@@ -211,7 +211,7 @@ test('only with expand arg', () => {
 });
 
 test('cannot test with no implementation with expand arg', () => {
-  const filename = 'only-constructs.test.js';
+  const filename = 'onlyConstructs.test.js';
   const content = `
     it('it', () => {});
     it('it, no implementation');
@@ -228,7 +228,7 @@ test('cannot test with no implementation with expand arg', () => {
 });
 
 test('function as descriptor', () => {
-  const filename = 'function-as-descriptor.test.js';
+  const filename = 'functionAsDescriptor.test.js';
   const content = `
     function Foo() {}
     describe(Foo, () => {
diff --git a/e2e/__tests__/haste_map_sha1.test.js b/e2e/__tests__/hasteMapSha1.test.js
similarity index 87%
rename from e2e/__tests__/haste_map_sha1.test.js
rename to e2e/__tests__/hasteMapSha1.test.js
index e9859953b7d0..9a9fa2b28ae4 100644
--- a/e2e/__tests__/haste_map_sha1.test.js
+++ b/e2e/__tests__/hasteMapSha1.test.js
@@ -24,8 +24,8 @@ test('exits the process after test are done but before timers complete', async (
     'file.android.js': '"foo android"',
     'file.ios.js': '"foo ios"',
     'file.js': '"foo default"',
-    'file_with_extension.ignored': '"ignored file"',
-    'node_modules/bar/file_with_extension.ignored': '"ignored node modules"',
+    'fileWithExtension.ignored': '"ignored file"',
+    'node_modules/bar/fileWithExtension.ignored': '"ignored node modules"',
     'node_modules/bar/image.png': '"an image"',
     'node_modules/bar/index.js': '"node modules bar"',
   });
@@ -70,13 +70,13 @@ test('exits the process after test are done but before timers complete', async (
 
   // Ignored files do not get the SHA-1 computed.
 
-  expect(hasteFS.getSha1(path.join(DIR, 'file_with_extension.ignored'))).toBe(
+  expect(hasteFS.getSha1(path.join(DIR, 'fileWithExtension.ignored'))).toBe(
     null,
   );
 
   expect(
     hasteFS.getSha1(
-      path.join(DIR, 'node_modules/bar/file_with_extension.ignored'),
+      path.join(DIR, 'node_modules/bar/fileWithExtension.ignored'),
     ),
   ).toBe(null);
 });
diff --git a/e2e/__tests__/haste_map_size.test.js b/e2e/__tests__/hasteMapSize.test.js
similarity index 100%
rename from e2e/__tests__/haste_map_size.test.js
rename to e2e/__tests__/hasteMapSize.test.js
diff --git a/e2e/__tests__/jasmine_async.test.js b/e2e/__tests__/jasmineAsync.test.js
similarity index 85%
rename from e2e/__tests__/jasmine_async.test.js
rename to e2e/__tests__/jasmineAsync.test.js
index 08d44591eaa2..f86aad6ecfca 100644
--- a/e2e/__tests__/jasmine_async.test.js
+++ b/e2e/__tests__/jasmineAsync.test.js
@@ -13,7 +13,7 @@ import runJest, {json as runWithJson} from '../runJest';
 
 describe('async jasmine', () => {
   it('works with beforeAll', () => {
-    const result = runWithJson('jasmine-async', ['promise_before_all.test.js']);
+    const result = runWithJson('jasmine-async', ['promiseBeforeAll.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(4);
@@ -29,9 +29,7 @@ describe('async jasmine', () => {
   });
 
   it('works with beforeEach', () => {
-    const result = runWithJson('jasmine-async', [
-      'promise_before_each.test.js',
-    ]);
+    const result = runWithJson('jasmine-async', ['promiseBeforeEach.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(3);
@@ -45,7 +43,7 @@ describe('async jasmine', () => {
   });
 
   it('works with afterAll', () => {
-    const result = runWithJson('jasmine-async', ['promise_after_all.test.js']);
+    const result = runWithJson('jasmine-async', ['promiseAfterAll.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(2);
@@ -58,7 +56,7 @@ describe('async jasmine', () => {
   });
 
   it('works with afterEach', () => {
-    const result = runWithJson('jasmine-async', ['promise_after_each.test.js']);
+    const result = runWithJson('jasmine-async', ['promiseAfterEach.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(2);
@@ -69,7 +67,7 @@ describe('async jasmine', () => {
   });
 
   it('works with fit', () => {
-    const result = runWithJson('jasmine-async', ['promise_fit.test.js']);
+    const result = runWithJson('jasmine-async', ['promiseFit.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(3);
@@ -80,7 +78,7 @@ describe('async jasmine', () => {
   });
 
   it('works with xit', () => {
-    const result = runWithJson('jasmine-async', ['promise_xit.test.js']);
+    const result = runWithJson('jasmine-async', ['promiseXit.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(2);
@@ -90,7 +88,7 @@ describe('async jasmine', () => {
   });
 
   it('throws when not a promise is returned', () => {
-    const result = runWithJson('jasmine-async', ['returning_values.test.js']);
+    const result = runWithJson('jasmine-async', ['returningValues.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(11);
@@ -100,7 +98,7 @@ describe('async jasmine', () => {
   });
 
   it('tests async promise code', () => {
-    const result = runWithJson('jasmine-async', ['promise_it.test.js']);
+    const result = runWithJson('jasmine-async', ['promiseIt.test.js']);
     const json = result.json;
     const message = json.testResults[0].message;
 
@@ -130,7 +128,7 @@ describe('async jasmine', () => {
   });
 
   it('async test fails', () => {
-    const result = runWithJson('jasmine-async', ['async_test_fails.test.js']);
+    const result = runWithJson('jasmine-async', ['asyncTestFails.test.js']);
 
     expect(result.status).toBe(1);
     expect(result.json.testResults[0].message).toEqual(
diff --git a/e2e/__tests__/jasmine_async_with_pending_during_test.js b/e2e/__tests__/jasmineAsyncWithPendingDuringTest.js
similarity index 89%
rename from e2e/__tests__/jasmine_async_with_pending_during_test.js
rename to e2e/__tests__/jasmineAsyncWithPendingDuringTest.js
index cf9cf54d84d9..cfb24c9adc30 100644
--- a/e2e/__tests__/jasmine_async_with_pending_during_test.js
+++ b/e2e/__tests__/jasmineAsyncWithPendingDuringTest.js
@@ -16,7 +16,7 @@ describe('async jasmine with pending during test', () => {
   skipSuiteOnJestCircus();
 
   it('should be reported as a pending test', () => {
-    const result = runWithJson('jasmine-async', ['pending_in_promise.test.js']);
+    const result = runWithJson('jasmine-async', ['pendingInPromise.test.js']);
     const json = result.json;
 
     expect(json.numTotalTests).toBe(1);
diff --git a/e2e/__tests__/jest_changed_files.test.js b/e2e/__tests__/jestChangedFiles.test.js
similarity index 77%
rename from e2e/__tests__/jest_changed_files.test.js
rename to e2e/__tests__/jestChangedFiles.test.js
index 0c1a4ad3ec6a..cdbbe646b706 100644
--- a/e2e/__tests__/jest_changed_files.test.js
+++ b/e2e/__tests__/jestChangedFiles.test.js
@@ -21,7 +21,7 @@ import runJest from '../runJest';
 
 skipSuiteOnWindows();
 
-const DIR = path.resolve(os.tmpdir(), 'jest_changed_files_test_dir');
+const DIR = path.resolve(os.tmpdir(), 'jest-changed-files-test-dir');
 
 const GIT = 'git -c user.name=jest_test -c user.email=jest_test@test.com';
 const HG = 'hg --config ui.username=jest_test';
@@ -31,23 +31,23 @@ afterEach(() => cleanup(DIR));
 
 test('gets hg SCM roots and dedups them', async () => {
   writeFiles(DIR, {
-    'first_repo/file1.txt': 'file1',
-    'first_repo/nested_dir/file2.txt': 'file2',
-    'first_repo/nested_dir/second_nested_dir/file3.txt': 'file3',
-    'second_repo/file1.txt': 'file1',
-    'second_repo/nested_dir/file2.txt': 'file2',
-    'second_repo/nested_dir/second_nested_dir/file3.txt': 'file3',
+    'first-repo/file1.txt': 'file1',
+    'first-repo/nested-dir/file2.txt': 'file2',
+    'first-repo/nested-dir/second-nested-dir/file3.txt': 'file3',
+    'second-repo/file1.txt': 'file1',
+    'second-repo/nested-dir/file2.txt': 'file2',
+    'second-repo/nested-dir/second-nested-dir/file3.txt': 'file3',
   });
 
-  run(`${HG} init`, path.resolve(DIR, 'first_repo'));
-  run(`${HG} init`, path.resolve(DIR, 'second_repo'));
+  run(`${HG} init`, path.resolve(DIR, 'first-repo'));
+  run(`${HG} init`, path.resolve(DIR, 'second-repo'));
 
   const roots = [
     '',
-    'first_repo/nested_dir',
-    'first_repo/nested_dir/second_nested_dir',
-    'second_repo/nested_dir',
-    'second_repo/nested_dir/second_nested_dir',
+    'first-repo/nested-dir',
+    'first-repo/nested-dir/second-nested-dir',
+    'second-repo/nested-dir',
+    'second-repo/nested-dir/second-nested-dir',
   ].map(filename => path.resolve(DIR, filename));
 
   const repos = await findRepos(roots);
@@ -60,29 +60,29 @@ test('gets hg SCM roots and dedups them', async () => {
   // NOTE: This test can break if you have a .hg repo initialized inside your
   // os tmp directory.
   expect(hgRepos).toHaveLength(2);
-  expect(hgRepos[0]).toMatch(/\/jest_changed_files_test_dir\/first_repo$/);
-  expect(hgRepos[1]).toMatch(/\/jest_changed_files_test_dir\/second_repo$/);
+  expect(hgRepos[0]).toMatch(/\/jest-changed-files-test-dir\/first-repo$/);
+  expect(hgRepos[1]).toMatch(/\/jest-changed-files-test-dir\/second-repo$/);
 });
 
 test('gets git SCM roots and dedups them', async () => {
   writeFiles(DIR, {
-    'first_repo/file1.txt': 'file1',
-    'first_repo/nested_dir/file2.txt': 'file2',
-    'first_repo/nested_dir/second_nested_dir/file3.txt': 'file3',
-    'second_repo/file1.txt': 'file1',
-    'second_repo/nested_dir/file2.txt': 'file2',
-    'second_repo/nested_dir/second_nested_dir/file3.txt': 'file3',
+    'first-repo/file1.txt': 'file1',
+    'first-repo/nested-dir/file2.txt': 'file2',
+    'first-repo/nested-dir/second-nested-dir/file3.txt': 'file3',
+    'second-repo/file1.txt': 'file1',
+    'second-repo/nested-dir/file2.txt': 'file2',
+    'second-repo/nested-dir/second-nested-dir/file3.txt': 'file3',
   });
 
-  run(`${GIT} init`, path.resolve(DIR, 'first_repo'));
-  run(`${GIT} init`, path.resolve(DIR, 'second_repo'));
+  run(`${GIT} init`, path.resolve(DIR, 'first-repo'));
+  run(`${GIT} init`, path.resolve(DIR, 'second-repo'));
 
   const roots = [
     '',
-    'first_repo/nested_dir',
-    'first_repo/nested_dir/second_nested_dir',
-    'second_repo/nested_dir',
-    'second_repo/nested_dir/second_nested_dir',
+    'first-repo/nested-dir',
+    'first-repo/nested-dir/second-nested-dir',
+    'second-repo/nested-dir',
+    'second-repo/nested-dir/second-nested-dir',
   ].map(filename => path.resolve(DIR, filename));
 
   const repos = await findRepos(roots);
@@ -94,29 +94,29 @@ test('gets git SCM roots and dedups them', async () => {
   // NOTE: This test can break if you have a .git repo initialized inside your
   // os tmp directory.
   expect(gitRepos).toHaveLength(2);
-  expect(gitRepos[0]).toMatch(/\/jest_changed_files_test_dir\/first_repo$/);
-  expect(gitRepos[1]).toMatch(/\/jest_changed_files_test_dir\/second_repo$/);
+  expect(gitRepos[0]).toMatch(/\/jest-changed-files-test-dir\/first-repo$/);
+  expect(gitRepos[1]).toMatch(/\/jest-changed-files-test-dir\/second-repo$/);
 });
 
 test('gets mixed git and hg SCM roots and dedups them', async () => {
   writeFiles(DIR, {
-    'first_repo/file1.txt': 'file1',
-    'first_repo/nested_dir/file2.txt': 'file2',
-    'first_repo/nested_dir/second_nested_dir/file3.txt': 'file3',
-    'second_repo/file1.txt': 'file1',
-    'second_repo/nested_dir/file2.txt': 'file2',
-    'second_repo/nested_dir/second_nested_dir/file3.txt': 'file3',
+    'first-repo/file1.txt': 'file1',
+    'first-repo/nested-dir/file2.txt': 'file2',
+    'first-repo/nested-dir/second-nested-dir/file3.txt': 'file3',
+    'second-repo/file1.txt': 'file1',
+    'second-repo/nested-dir/file2.txt': 'file2',
+    'second-repo/nested-dir/second-nested-dir/file3.txt': 'file3',
   });
 
-  run(`${GIT} init`, path.resolve(DIR, 'first_repo'));
-  run(`${HG} init`, path.resolve(DIR, 'second_repo'));
+  run(`${GIT} init`, path.resolve(DIR, 'first-repo'));
+  run(`${HG} init`, path.resolve(DIR, 'second-repo'));
 
   const roots = [
     '',
-    'first_repo/nested_dir',
-    'first_repo/nested_dir/second_nested_dir',
-    'second_repo/nested_dir',
-    'second_repo/nested_dir/second_nested_dir',
+    'first-repo/nested-dir',
+    'first-repo/nested-dir/second-nested-dir',
+    'second-repo/nested-dir',
+    'second-repo/nested-dir/second-nested-dir',
   ].map(filename => path.resolve(DIR, filename));
 
   const repos = await findRepos(roots);
@@ -127,20 +127,20 @@ test('gets mixed git and hg SCM roots and dedups them', async () => {
   // inside your os tmp directory.
   expect(gitRepos).toHaveLength(1);
   expect(hgRepos).toHaveLength(1);
-  expect(gitRepos[0]).toMatch(/\/jest_changed_files_test_dir\/first_repo$/);
-  expect(hgRepos[0]).toMatch(/\/jest_changed_files_test_dir\/second_repo$/);
+  expect(gitRepos[0]).toMatch(/\/jest-changed-files-test-dir\/first-repo$/);
+  expect(hgRepos[0]).toMatch(/\/jest-changed-files-test-dir\/second-repo$/);
 });
 
 test('gets changed files for git', async () => {
   writeFiles(DIR, {
     'file1.txt': 'file1',
-    'nested_dir/file2.txt': 'file2',
-    'nested_dir/second_nested_dir/file3.txt': 'file3',
+    'nested-dir/file2.txt': 'file2',
+    'nested-dir/second-nested-dir/file3.txt': 'file3',
   });
 
   run(`${GIT} init`, DIR);
 
-  const roots = ['', 'nested_dir', 'nested_dir/second_nested_dir'].map(
+  const roots = ['', 'nested-dir', 'nested-dir/second-nested-dir'].map(
     filename => path.resolve(DIR, filename),
   );
 
@@ -228,13 +228,13 @@ test('gets changed files for git', async () => {
 test('monitors only root paths for git', async () => {
   writeFiles(DIR, {
     'file1.txt': 'file1',
-    'nested_dir/file2.txt': 'file2',
-    'nested_dir/second_nested_dir/file3.txt': 'file3',
+    'nested-dir/file2.txt': 'file2',
+    'nested-dir/second-nested-dir/file3.txt': 'file3',
   });
 
   run(`${GIT} init`, DIR);
 
-  const roots = [path.resolve(DIR, 'nested_dir')];
+  const roots = [path.resolve(DIR, 'nested-dir')];
 
   const {changedFiles: files} = await getChangedFilesForRoots(roots, {});
   expect(
@@ -272,13 +272,13 @@ test('gets changed files for hg', async () => {
   }
   writeFiles(DIR, {
     'file1.txt': 'file1',
-    'nested_dir/file2.txt': 'file2',
-    'nested_dir/second_nested_dir/file3.txt': 'file3',
+    'nested-dir/file2.txt': 'file2',
+    'nested-dir/second-nested-dir/file3.txt': 'file3',
   });
 
   run(`${HG} init`, DIR);
 
-  const roots = ['', 'nested_dir', 'nested_dir/second_nested_dir'].map(
+  const roots = ['', 'nested-dir', 'nested-dir/second-nested-dir'].map(
     filename => path.resolve(DIR, filename),
   );
 
@@ -375,13 +375,13 @@ test('monitors only root paths for hg', async () => {
   }
   writeFiles(DIR, {
     'file1.txt': 'file1',
-    'nested_dir/file2.txt': 'file2',
-    'nested_dir/second_nested_dir/file3.txt': 'file3',
+    'nested-dir/file2.txt': 'file2',
+    'nested-dir/second-nested-dir/file3.txt': 'file3',
   });
 
   run(`${HG} init`, DIR);
 
-  const roots = [path.resolve(DIR, 'nested_dir')];
+  const roots = [path.resolve(DIR, 'nested-dir')];
 
   const {changedFiles: files} = await getChangedFilesForRoots(roots, {});
   expect(
diff --git a/e2e/__tests__/jest_require_actual.test.js b/e2e/__tests__/jestRequireActual.test.js
similarity index 95%
rename from e2e/__tests__/jest_require_actual.test.js
rename to e2e/__tests__/jestRequireActual.test.js
index 57bf9c713fd5..ad7e2ae975e3 100644
--- a/e2e/__tests__/jest_require_actual.test.js
+++ b/e2e/__tests__/jestRequireActual.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import {cleanup, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(os.tmpdir(), 'jest_require_actual_test');
+const DIR = path.resolve(os.tmpdir(), 'jest-require-actual-test');
 
 beforeEach(() => cleanup(DIR));
 afterAll(() => cleanup(DIR));
diff --git a/e2e/__tests__/jest_require_mock.test.js b/e2e/__tests__/jestRequireMock.test.js
similarity index 95%
rename from e2e/__tests__/jest_require_mock.test.js
rename to e2e/__tests__/jestRequireMock.test.js
index 26ea0ddc2ae1..eefe8c0bc577 100644
--- a/e2e/__tests__/jest_require_mock.test.js
+++ b/e2e/__tests__/jestRequireMock.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import {cleanup, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(os.tmpdir(), 'jest_require_mock_test');
+const DIR = path.resolve(os.tmpdir(), 'jest-require-mock-test');
 
 beforeEach(() => cleanup(DIR));
 afterAll(() => cleanup(DIR));
diff --git a/e2e/__tests__/json_reporter.test.js b/e2e/__tests__/jsonReporter.test.js
similarity index 100%
rename from e2e/__tests__/json_reporter.test.js
rename to e2e/__tests__/jsonReporter.test.js
diff --git a/e2e/__tests__/list_tests.test.js b/e2e/__tests__/listTests.test.js
similarity index 100%
rename from e2e/__tests__/list_tests.test.js
rename to e2e/__tests__/listTests.test.js
diff --git a/e2e/__tests__/location_in_results.test.js b/e2e/__tests__/locationInResults.test.js
similarity index 100%
rename from e2e/__tests__/location_in_results.test.js
rename to e2e/__tests__/locationInResults.test.js
diff --git a/e2e/__tests__/log_heap_usage.test.js b/e2e/__tests__/logHeapUsage.test.js
similarity index 100%
rename from e2e/__tests__/log_heap_usage.test.js
rename to e2e/__tests__/logHeapUsage.test.js
diff --git a/e2e/__tests__/mock_names.test.js b/e2e/__tests__/mockNames.test.js
similarity index 100%
rename from e2e/__tests__/mock_names.test.js
rename to e2e/__tests__/mockNames.test.js
diff --git a/e2e/__tests__/module_name_mapper.test.js b/e2e/__tests__/moduleNameMapper.test.js
similarity index 100%
rename from e2e/__tests__/module_name_mapper.test.js
rename to e2e/__tests__/moduleNameMapper.test.js
diff --git a/e2e/__tests__/module_parent_null_in_test.js b/e2e/__tests__/moduleParentNullInTest.js
similarity index 86%
rename from e2e/__tests__/module_parent_null_in_test.js
rename to e2e/__tests__/moduleParentNullInTest.js
index 26fdef469a9a..127a2d2a0e1e 100644
--- a/e2e/__tests__/module_parent_null_in_test.js
+++ b/e2e/__tests__/moduleParentNullInTest.js
@@ -11,7 +11,7 @@
 import runJest from '../runJest';
 
 test('module.parent should be null in test files', () => {
-  const {status} = runJest('module_parent_null_in_test');
+  const {status} = runJest('module-parent-null-in-test');
 
   expect(status).toBe(0);
 });
diff --git a/e2e/__tests__/multi_project_runner.test.js b/e2e/__tests__/multiProjectRunner.test.js
similarity index 98%
rename from e2e/__tests__/multi_project_runner.test.js
rename to e2e/__tests__/multiProjectRunner.test.js
index 9583d9206b49..38d99dc29d9a 100644
--- a/e2e/__tests__/multi_project_runner.test.js
+++ b/e2e/__tests__/multiProjectRunner.test.js
@@ -15,7 +15,7 @@ import path from 'path';
 import stripAnsi from 'strip-ansi';
 import {cleanup, extractSummary, sortLines, writeFiles} from '../Utils';
 
-const DIR = path.resolve(os.tmpdir(), 'multi_project_runner_test');
+const DIR = path.resolve(os.tmpdir(), 'multi-project-runner-test');
 
 const SAMPLE_FILE_CONTENT = 'module.exports = {};';
 
@@ -27,7 +27,7 @@ test('--listTests doesnt duplicate the test files', () => {
     '.watchmanconfig': '',
     '/project1.js': `module.exports = {rootDir: './', displayName: 'BACKEND'}`,
     '/project2.js': `module.exports = {rootDir: './', displayName: 'BACKEND'}`,
-    '__tests__/in_both_projects-test.js': `test('test', () => {});`,
+    '__tests__/inBothProjectsTest.js': `test('test', () => {});`,
     'package.json': JSON.stringify({
       jest: {projects: ['<rootDir>/project1.js', '<rootDir>/project2.js']},
     }),
@@ -35,7 +35,7 @@ test('--listTests doesnt duplicate the test files', () => {
 
   const {stdout} = runJest(DIR, ['--listTests']);
   expect(stdout.split('\n')).toHaveLength(1);
-  expect(stdout).toMatch('in_both_projects-test.js');
+  expect(stdout).toMatch('inBothProjectsTest.js');
 });
 
 test('can pass projects or global config', () => {
diff --git a/e2e/__tests__/native_async_mock.test.js b/e2e/__tests__/nativeAsyncMock.test.js
similarity index 100%
rename from e2e/__tests__/native_async_mock.test.js
rename to e2e/__tests__/nativeAsyncMock.test.js
diff --git a/e2e/__tests__/nested_event_loop.test.js b/e2e/__tests__/nestedEventLoop.test.js
similarity index 100%
rename from e2e/__tests__/nested_event_loop.test.js
rename to e2e/__tests__/nestedEventLoop.test.js
diff --git a/e2e/__tests__/no_test_found.test.js b/e2e/__tests__/noTestFound.test.js
similarity index 100%
rename from e2e/__tests__/no_test_found.test.js
rename to e2e/__tests__/noTestFound.test.js
diff --git a/e2e/__tests__/no_tests_found.test.js b/e2e/__tests__/noTestsFound.test.js
similarity index 100%
rename from e2e/__tests__/no_tests_found.test.js
rename to e2e/__tests__/noTestsFound.test.js
diff --git a/e2e/__tests__/node_path.test.js b/e2e/__tests__/nodePath.test.js
similarity index 100%
rename from e2e/__tests__/node_path.test.js
rename to e2e/__tests__/nodePath.test.js
diff --git a/e2e/__tests__/only_changed.test.js b/e2e/__tests__/onlyChanged.test.js
similarity index 100%
rename from e2e/__tests__/only_changed.test.js
rename to e2e/__tests__/onlyChanged.test.js
diff --git a/e2e/__tests__/override-globals.test.js b/e2e/__tests__/overrideGlobals.test.js
similarity index 100%
rename from e2e/__tests__/override-globals.test.js
rename to e2e/__tests__/overrideGlobals.test.js
diff --git a/e2e/__tests__/process_exit.test.js b/e2e/__tests__/processExit.test.js
similarity index 100%
rename from e2e/__tests__/process_exit.test.js
rename to e2e/__tests__/processExit.test.js
diff --git a/e2e/__tests__/promise_reject.test.js b/e2e/__tests__/promiseReject.test.js
similarity index 95%
rename from e2e/__tests__/promise_reject.test.js
rename to e2e/__tests__/promiseReject.test.js
index c2c6514ec0e9..38620a5da78f 100644
--- a/e2e/__tests__/promise_reject.test.js
+++ b/e2e/__tests__/promiseReject.test.js
@@ -20,7 +20,7 @@ afterEach(() => cleanup(DIR));
 test('', () => {
   writeFiles(DIR, {
     'package.json': '{}',
-    'promise_reject.test.js': `
+    'promiseReject.test.js': `
      test('test', () => {
        return Promise.reject(null)
      });
diff --git a/e2e/__tests__/regex_(char_in_path.test.js b/e2e/__tests__/regexCharInPath.test.js
similarity index 100%
rename from e2e/__tests__/regex_(char_in_path.test.js
rename to e2e/__tests__/regexCharInPath.test.js
diff --git a/e2e/__tests__/require_after_teardown.test.js b/e2e/__tests__/requireAfterTeardown.test.js
similarity index 90%
rename from e2e/__tests__/require_after_teardown.test.js
rename to e2e/__tests__/requireAfterTeardown.test.js
index c49220af5022..ed868db4b7df 100644
--- a/e2e/__tests__/require_after_teardown.test.js
+++ b/e2e/__tests__/requireAfterTeardown.test.js
@@ -21,6 +21,6 @@ test('prints useful error for requires after test is done', () => {
 
   expect(interestingLines).toMatchSnapshot();
   expect(stderr.split('\n')[19]).toMatch(
-    new RegExp('(__tests__/late-require.test.js:11:20)'),
+    new RegExp('(__tests__/lateRequire.test.js:11:20)'),
   );
 });
diff --git a/e2e/__tests__/require_main.test.js b/e2e/__tests__/requireMain.test.js
similarity index 100%
rename from e2e/__tests__/require_main.test.js
rename to e2e/__tests__/requireMain.test.js
diff --git a/e2e/__tests__/require_v8_module.test.js b/e2e/__tests__/requireV8Module.test.js
similarity index 100%
rename from e2e/__tests__/require_v8_module.test.js
rename to e2e/__tests__/requireV8Module.test.js
diff --git a/e2e/__tests__/reset_modules.test.js b/e2e/__tests__/resetModules.test.js
similarity index 90%
rename from e2e/__tests__/reset_modules.test.js
rename to e2e/__tests__/resetModules.test.js
index 67fc0de861ce..b2a7fef3548c 100644
--- a/e2e/__tests__/reset_modules.test.js
+++ b/e2e/__tests__/resetModules.test.js
@@ -11,6 +11,6 @@
 import runJest from '../runJest';
 
 test('jest.resetModules should not error when _isMockFunction is defined but not boolean', () => {
-  const result = runJest('reset_modules');
+  const result = runJest('reset-modules');
   expect(result.status).toBe(0);
 });
diff --git a/e2e/__tests__/resolve-get-paths.test.js b/e2e/__tests__/resolveGetPaths.test.js
similarity index 100%
rename from e2e/__tests__/resolve-get-paths.test.js
rename to e2e/__tests__/resolveGetPaths.test.js
diff --git a/e2e/__tests__/resolve_no_file_extensions.test.js b/e2e/__tests__/resolveNoFileExtensions.test.js
similarity index 84%
rename from e2e/__tests__/resolve_no_file_extensions.test.js
rename to e2e/__tests__/resolveNoFileExtensions.test.js
index 1fcfe127aae7..1354556e047f 100644
--- a/e2e/__tests__/resolve_no_file_extensions.test.js
+++ b/e2e/__tests__/resolveNoFileExtensions.test.js
@@ -12,13 +12,13 @@ import path from 'path';
 import runJest from '../runJest';
 import {cleanup, extractSummary, writeFiles} from '../Utils';
 
-const DIR = path.resolve(__dirname, '../resolve_no_extensions-no-js');
+const DIR = path.resolve(__dirname, '../resolve-no-extensions-no-js');
 
 beforeEach(() => cleanup(DIR));
 afterAll(() => cleanup(DIR));
 
 test('show error message with matching files', () => {
-  const {status, stderr} = runJest('resolve_no_extensions');
+  const {status, stderr} = runJest('resolve-no-extensions');
   const {rest} = extractSummary(stderr);
 
   expect(status).toBe(1);
@@ -46,7 +46,7 @@ test('show error message when no js moduleFileExtensions', () => {
     `,
   });
 
-  const {status, stderr} = runJest('resolve_no_extensions-no-js');
+  const {status, stderr} = runJest('resolve-no-extensions-no-js');
 
   expect(status).toBe(1);
   expect(stderr).toMatchSnapshot();
diff --git a/e2e/__tests__/resolve-node-module.test.js b/e2e/__tests__/resolveNodeModule.test.js
similarity index 100%
rename from e2e/__tests__/resolve-node-module.test.js
rename to e2e/__tests__/resolveNodeModule.test.js
diff --git a/e2e/__tests__/resolve-with-paths.test.js b/e2e/__tests__/resolveWithPaths.test.js
similarity index 100%
rename from e2e/__tests__/resolve-with-paths.test.js
rename to e2e/__tests__/resolveWithPaths.test.js
diff --git a/e2e/__tests__/run_tests_by_path.test.js b/e2e/__tests__/runTestsByPath.test.js
similarity index 95%
rename from e2e/__tests__/run_tests_by_path.test.js
rename to e2e/__tests__/runTestsByPath.test.js
index 6fa5ccfc14d2..14d29b9d5dd5 100644
--- a/e2e/__tests__/run_tests_by_path.test.js
+++ b/e2e/__tests__/runTestsByPath.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import path from 'path';
 import {cleanup, writeFiles} from '../Utils';
 
-const DIR = path.resolve(os.tmpdir(), 'run_tests_by_path_test');
+const DIR = path.resolve(os.tmpdir(), 'run-tests-by-path-test');
 
 beforeEach(() => cleanup(DIR));
 afterEach(() => cleanup(DIR));
diff --git a/e2e/__tests__/runtime_internal_module_registry.test.js b/e2e/__tests__/runtimeInternalModuleRegistry.test.js
similarity index 100%
rename from e2e/__tests__/runtime_internal_module_registry.test.js
rename to e2e/__tests__/runtimeInternalModuleRegistry.test.js
diff --git a/e2e/__tests__/set_immediate.test.js b/e2e/__tests__/setImmediate.test.js
similarity index 100%
rename from e2e/__tests__/set_immediate.test.js
rename to e2e/__tests__/setImmediate.test.js
diff --git a/e2e/__tests__/setup_files_after_env_config.test.js b/e2e/__tests__/setupFilesAfterEnvConfig.test.js
similarity index 94%
rename from e2e/__tests__/setup_files_after_env_config.test.js
rename to e2e/__tests__/setupFilesAfterEnvConfig.test.js
index 1c45d25b6b62..a2ec3b6a3f38 100644
--- a/e2e/__tests__/setup_files_after_env_config.test.js
+++ b/e2e/__tests__/setupFilesAfterEnvConfig.test.js
@@ -50,7 +50,7 @@ describe('setupFilesAfterEnv', () => {
   it('requires setup files *after* the test runners are required', () => {
     const pkgJson = {
       jest: {
-        setupFilesAfterEnv: ['./setup_hooks_into_runner.js'],
+        setupFilesAfterEnv: ['./setupHooksIntoRunner.js'],
       },
     };
 
@@ -59,7 +59,7 @@ describe('setupFilesAfterEnv', () => {
     });
 
     const result = runWithJson('setup-files-after-env-config', [
-      'runner_patch.test.js',
+      'runnerPatch.test.js',
     ]);
 
     expect(result.json.numTotalTests).toBe(1);
diff --git a/e2e/__tests__/show_config.test.js b/e2e/__tests__/showConfig.test.js
similarity index 91%
rename from e2e/__tests__/show_config.test.js
rename to e2e/__tests__/showConfig.test.js
index 871cb59e95df..013ae8f7ad24 100644
--- a/e2e/__tests__/show_config.test.js
+++ b/e2e/__tests__/showConfig.test.js
@@ -17,7 +17,7 @@ import {cleanup, writeFiles} from '../Utils';
 
 skipSuiteOnWindows();
 
-const DIR = path.resolve(os.tmpdir(), 'show_config_test');
+const DIR = path.resolve(os.tmpdir(), 'show-config-test');
 
 beforeEach(() => cleanup(DIR));
 afterEach(() => cleanup(DIR));
@@ -40,7 +40,7 @@ test('--showConfig outputs config info and exits', () => {
     .replace(/"name": "(.+)"/g, '"name": "[md5 hash]"')
     .replace(/"version": "(.+)"/g, '"version": "[version]"')
     .replace(/"maxWorkers": (\d+)/g, '"maxWorkers": "[maxWorkers]"')
-    .replace(/\"\S*show_config_test/gm, '"<<REPLACED_ROOT_DIR>>')
+    .replace(/\"\S*show-config-test/gm, '"<<REPLACED_ROOT_DIR>>')
     .replace(/\"\S*\/jest\/packages/gm, '"<<REPLACED_JEST_PACKAGES_DIR>>');
 
   expect(stdout).toMatchSnapshot();
diff --git a/e2e/__tests__/snapshot.test.js b/e2e/__tests__/snapshot.test.js
index 48c9d190467e..643023492d0b 100644
--- a/e2e/__tests__/snapshot.test.js
+++ b/e2e/__tests__/snapshot.test.js
@@ -21,7 +21,7 @@ const snapshotDir = path.resolve(
 const snapshotFile = path.resolve(snapshotDir, 'snapshot.test.js.snap');
 const secondSnapshotFile = path.resolve(
   snapshotDir,
-  'second_snapshot.test.js.snap',
+  'secondSnapshot.test.js.snap',
 );
 const snapshotOfCopy = path.resolve(snapshotDir, 'snapshot.test_copy.js.snap');
 const originalTestPath = path.resolve(
@@ -49,11 +49,11 @@ const snapshotEscapeFile = path.resolve(
 );
 const snapshotEscapeRegexFile = path.resolve(
   snapshotEscapeSnapshotDir,
-  'snapshot_escape_regex.js.snap',
+  'snapshotEscapeRegex.js.snap',
 );
 const snapshotEscapeSubstitutionFile = path.resolve(
   snapshotEscapeSnapshotDir,
-  'snapshot_escape_substitution.test.js.snap',
+  'snapshotEscapeSubstitution.test.js.snap',
 );
 
 const initialTestData = fs.readFileSync(snapshotEscapeTestFile, 'utf8');
@@ -170,7 +170,7 @@ describe('Snapshot', () => {
     let result = runJest('snapshot-escape', [
       '-w=1',
       '--ci=false',
-      'snapshot_escape_regex.js',
+      'snapshotEscapeRegex.js',
     ]);
     let stderr = result.stderr;
 
@@ -181,7 +181,7 @@ describe('Snapshot', () => {
     result = runJest('snapshot-escape', [
       '-w=1',
       '--ci=false',
-      'snapshot_escape_regex.js',
+      'snapshotEscapeRegex.js',
     ]);
     stderr = result.stderr;
 
@@ -197,7 +197,7 @@ describe('Snapshot', () => {
     let result = runJest('snapshot-escape', [
       '-w=1',
       '--ci=false',
-      'snapshot_escape_substitution.test.js',
+      'snapshotEscapeSubstitution.test.js',
     ]);
     let stderr = result.stderr;
 
@@ -208,7 +208,7 @@ describe('Snapshot', () => {
     result = runJest('snapshot-escape', [
       '-w=1',
       '--ci=false',
-      'snapshot_escape_substitution.test.js',
+      'snapshotEscapeSubstitution.test.js',
     ]);
     stderr = result.stderr;
 
diff --git a/e2e/__tests__/snapshot-mock-fs.test.js b/e2e/__tests__/snapshotMockFs.test.js
similarity index 100%
rename from e2e/__tests__/snapshot-mock-fs.test.js
rename to e2e/__tests__/snapshotMockFs.test.js
diff --git a/e2e/__tests__/snapshot_resolver.test.js b/e2e/__tests__/snapshotResolver.test.js
similarity index 100%
rename from e2e/__tests__/snapshot_resolver.test.js
rename to e2e/__tests__/snapshotResolver.test.js
diff --git a/e2e/__tests__/snapshot_serializers.test.js b/e2e/__tests__/snapshotSerializers.test.js
similarity index 100%
rename from e2e/__tests__/snapshot_serializers.test.js
rename to e2e/__tests__/snapshotSerializers.test.js
diff --git a/e2e/__tests__/stack_trace.test.js b/e2e/__tests__/stackTrace.test.js
similarity index 76%
rename from e2e/__tests__/stack_trace.test.js
rename to e2e/__tests__/stackTrace.test.js
index e34259057c94..f0a88a613371 100644
--- a/e2e/__tests__/stack_trace.test.js
+++ b/e2e/__tests__/stackTrace.test.js
@@ -13,7 +13,7 @@ import {extractSummary} from '../Utils';
 
 describe('Stack Trace', () => {
   it('prints a stack trace for runtime errors', () => {
-    const {status, stderr} = runJest('stack-trace', ['runtime_error.test.js']);
+    const {status, stderr} = runJest('stack-trace', ['runtimeError.test.js']);
 
     expect(extractSummary(stderr).summary).toMatchSnapshot();
 
@@ -23,13 +23,13 @@ describe('Stack Trace', () => {
     );
     expect(stderr).toMatch(/> 10 \| thisIsARuntimeError\(\);/);
     expect(stderr).toMatch(
-      /\s+at\s(?:.+?)\s\(__tests__\/runtime_error.test\.js/,
+      /\s+at\s(?:.+?)\s\(__tests__\/runtimeError.test\.js/,
     );
   });
 
   it('does not print a stack trace for runtime errors when --noStackTrace is given', () => {
     const {status, stderr} = runJest('stack-trace', [
-      'runtime_error.test.js',
+      'runtimeError.test.js',
       '--noStackTrace',
     ]);
 
@@ -40,22 +40,22 @@ describe('Stack Trace', () => {
       /ReferenceError: thisIsARuntimeError is not defined/,
     );
     expect(stderr).not.toMatch(
-      /\s+at\s(?:.+?)\s\(__tests__\/runtime_error.test\.js/,
+      /\s+at\s(?:.+?)\s\(__tests__\/runtimeError.test\.js/,
     );
   });
 
   it('prints a stack trace for matching errors', () => {
-    const {status, stderr} = runJest('stack-trace', ['stack_trace.test.js']);
+    const {status, stderr} = runJest('stack-trace', ['stackTrace.test.js']);
 
     expect(extractSummary(stderr).summary).toMatchSnapshot();
     expect(status).toBe(1);
 
-    expect(stderr).toMatch(/\s+at\s(?:.+?)\s\(__tests__\/stack_trace.test\.js/);
+    expect(stderr).toMatch(/\s+at\s(?:.+?)\s\(__tests__\/stackTrace.test\.js/);
   });
 
   it('does not print a stack trace for matching errors when --noStackTrace is given', () => {
     const {status, stderr} = runJest('stack-trace', [
-      'stack_trace.test.js',
+      'stackTrace.test.js',
       '--noStackTrace',
     ]);
 
@@ -63,12 +63,12 @@ describe('Stack Trace', () => {
     expect(status).toBe(1);
 
     expect(stderr).not.toMatch(
-      /\s+at\s(?:.+?)\s\(__tests__\/stack_trace.test\.js/,
+      /\s+at\s(?:.+?)\s\(__tests__\/stackTrace.test\.js/,
     );
   });
 
   it('prints a stack trace for errors', () => {
-    const {status, stderr} = runJest('stack-trace', ['test_error.test.js']);
+    const {status, stderr} = runJest('stack-trace', ['testError.test.js']);
 
     expect(extractSummary(stderr).summary).toMatchSnapshot();
     expect(status).toBe(1);
@@ -76,11 +76,11 @@ describe('Stack Trace', () => {
     expect(stderr).toMatch(/this is unexpected\./);
     expect(stderr).toMatch(/this is a string\./);
 
-    expect(stderr).toMatch(/\s+at\s(?:.+?)\s\(__tests__\/test_error.test\.js/);
+    expect(stderr).toMatch(/\s+at\s(?:.+?)\s\(__tests__\/testError.test\.js/);
 
     // Make sure we show Jest's jest-resolve as part of the stack trace
     expect(stderr).toMatch(
-      /Cannot find module 'this-module-does-not-exist' from 'test_error.test\.js'/,
+      /Cannot find module 'this-module-does-not-exist' from 'testError.test\.js'/,
     );
 
     expect(stderr).toMatch(
@@ -90,7 +90,7 @@ describe('Stack Trace', () => {
 
   it('prints a stack trace for errors without message in stack trace', () => {
     const {status, stderr} = runJest('stack-trace', [
-      'stack_trace_without_message.test.js',
+      'stackTraceWithoutMessage.test.js',
     ]);
 
     expect(extractSummary(stderr).summary).toMatchSnapshot();
@@ -98,13 +98,13 @@ describe('Stack Trace', () => {
 
     expect(stderr).toMatch(/important message/);
     expect(stderr).toMatch(
-      /\s+at\s(?:.+?)\s\(__tests__\/stack_trace_without_message.test\.js/,
+      /\s+at\s(?:.+?)\s\(__tests__\/stackTraceWithoutMessage.test\.js/,
     );
   });
 
   it('does not print a stack trace for errors when --noStackTrace is given', () => {
     const {status, stderr} = runJest('stack-trace', [
-      'test_error.test.js',
+      'testError.test.js',
       '--noStackTrace',
     ]);
 
@@ -112,7 +112,7 @@ describe('Stack Trace', () => {
     expect(status).toBe(1);
 
     expect(stderr).not.toMatch(
-      /\s+at\s(?:.+?)\s\(__tests__\/test_error.test\.js/,
+      /\s+at\s(?:.+?)\s\(__tests__\/testError.test\.js/,
     );
   });
 });
diff --git a/e2e/__tests__/stack_trace_no_captureStackTrace.test.js b/e2e/__tests__/stackTraceNoCaptureStackTrace.test.js
similarity index 100%
rename from e2e/__tests__/stack_trace_no_captureStackTrace.test.js
rename to e2e/__tests__/stackTraceNoCaptureStackTrace.test.js
diff --git a/e2e/__tests__/stack_trace_source_maps.test.js b/e2e/__tests__/stackTraceSourceMaps.test.js
similarity index 100%
rename from e2e/__tests__/stack_trace_source_maps.test.js
rename to e2e/__tests__/stackTraceSourceMaps.test.js
diff --git a/e2e/__tests__/supports-dashed-args.js b/e2e/__tests__/supportsDashedArgs.js
similarity index 100%
rename from e2e/__tests__/supports-dashed-args.js
rename to e2e/__tests__/supportsDashedArgs.js
diff --git a/e2e/__tests__/test_environment.test.js b/e2e/__tests__/testEnvironment.test.js
similarity index 100%
rename from e2e/__tests__/test_environment.test.js
rename to e2e/__tests__/testEnvironment.test.js
diff --git a/e2e/__tests__/test_environment_async.test.js b/e2e/__tests__/testEnvironmentAsync.test.js
similarity index 100%
rename from e2e/__tests__/test_environment_async.test.js
rename to e2e/__tests__/testEnvironmentAsync.test.js
diff --git a/e2e/__tests__/test_failure_exit_code.test.js b/e2e/__tests__/testFailureExitCode.test.js
similarity index 94%
rename from e2e/__tests__/test_failure_exit_code.test.js
rename to e2e/__tests__/testFailureExitCode.test.js
index fd80614624b2..2fd1e4ad171b 100644
--- a/e2e/__tests__/test_failure_exit_code.test.js
+++ b/e2e/__tests__/testFailureExitCode.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import {cleanup, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(os.tmpdir(), 'test_failure_exit_code_test');
+const DIR = path.resolve(os.tmpdir(), 'test-failure-exit-code-test');
 
 beforeEach(() => cleanup(DIR));
 afterAll(() => cleanup(DIR));
diff --git a/e2e/__tests__/test_in_root.test.js b/e2e/__tests__/testInRoot.test.js
similarity index 100%
rename from e2e/__tests__/test_in_root.test.js
rename to e2e/__tests__/testInRoot.test.js
diff --git a/e2e/__tests__/test_name_pattern.test.js b/e2e/__tests__/testNamePattern.test.js
similarity index 89%
rename from e2e/__tests__/test_name_pattern.test.js
rename to e2e/__tests__/testNamePattern.test.js
index 0af11d40a21d..6c47547cf66f 100644
--- a/e2e/__tests__/test_name_pattern.test.js
+++ b/e2e/__tests__/testNamePattern.test.js
@@ -12,7 +12,7 @@ import {extractSummary} from '../Utils';
 import {json as runWithJson} from '../runJest';
 
 test('testNamePattern', () => {
-  const {stderr, status} = runWithJson('testNamePattern', [
+  const {stderr, status} = runWithJson('test-name-pattern', [
     '--testNamePattern',
     'should match',
   ]);
diff --git a/e2e/__tests__/test_name_pattern_skipped.test.js b/e2e/__tests__/testNamePatternSkipped.test.js
similarity index 88%
rename from e2e/__tests__/test_name_pattern_skipped.test.js
rename to e2e/__tests__/testNamePatternSkipped.test.js
index 23155ec96015..5bb7fbe23701 100644
--- a/e2e/__tests__/test_name_pattern_skipped.test.js
+++ b/e2e/__tests__/testNamePatternSkipped.test.js
@@ -12,7 +12,7 @@ import {extractSummary} from '../Utils';
 import {json as runWithJson} from '../runJest';
 
 test('testNamePattern skipped', () => {
-  const {stderr, status} = runWithJson('testNamePattern_skipped', [
+  const {stderr, status} = runWithJson('test-name-pattern-skipped', [
     '--testNamePattern',
     'false',
   ]);
diff --git a/e2e/__tests__/test_path_pattern_reporter_message.test.js b/e2e/__tests__/testPathPatternReporterMessage.test.js
similarity index 93%
rename from e2e/__tests__/test_path_pattern_reporter_message.test.js
rename to e2e/__tests__/testPathPatternReporterMessage.test.js
index 922231e2b6ed..c09320c21702 100644
--- a/e2e/__tests__/test_path_pattern_reporter_message.test.js
+++ b/e2e/__tests__/testPathPatternReporterMessage.test.js
@@ -13,7 +13,7 @@ import os from 'os';
 import path from 'path';
 import {cleanup, writeFiles} from '../Utils';
 
-const DIR = path.resolve(os.tmpdir(), 'jest_path_pattern_reporter_message');
+const DIR = path.resolve(os.tmpdir(), 'jest-path-pattern-reporter-message');
 
 beforeEach(() => cleanup(DIR));
 afterEach(() => cleanup(DIR));
diff --git a/e2e/__tests__/test_results_processor.test.js b/e2e/__tests__/testResultsProcessor.test.js
similarity index 83%
rename from e2e/__tests__/test_results_processor.test.js
rename to e2e/__tests__/testResultsProcessor.test.js
index 7ecc794cc9b5..5230167a5aee 100644
--- a/e2e/__tests__/test_results_processor.test.js
+++ b/e2e/__tests__/testResultsProcessor.test.js
@@ -13,9 +13,9 @@ import {json as runWithJson} from '../runJest';
 test('testNamePattern', () => {
   const processorPath = path.resolve(
     __dirname,
-    '../testResultsProcessor/processor.js',
+    '../test-results-processor/processor.js',
   );
-  const result = runWithJson('testResultsProcessor', [
+  const result = runWithJson('test-results-processor', [
     '--json',
     `--testResultsProcessor=${processorPath}`,
   ]);
diff --git a/e2e/__tests__/test_retries.test.js b/e2e/__tests__/testRetries.test.js
similarity index 100%
rename from e2e/__tests__/test_retries.test.js
rename to e2e/__tests__/testRetries.test.js
diff --git a/e2e/__tests__/test-todo.test.js b/e2e/__tests__/testTodo.test.js
similarity index 86%
rename from e2e/__tests__/test-todo.test.js
rename to e2e/__tests__/testTodo.test.js
index fa930382bc70..d6c24febbbee 100644
--- a/e2e/__tests__/test-todo.test.js
+++ b/e2e/__tests__/testTodo.test.js
@@ -22,21 +22,21 @@ test('works with all statuses', () => {
 });
 
 test('shows error messages when called with no arguments', () => {
-  const result = runJest(dir, ['todo_no_args.test.js']);
+  const result = runJest(dir, ['todoNoArgs.test.js']);
   expect(result.status).toBe(1);
   const {rest} = extractSummary(result.stderr);
   expect(rest).toMatchSnapshot();
 });
 
 test('shows error messages when called with multiple arguments', () => {
-  const result = runJest(dir, ['todo_multiple_args.test.js']);
+  const result = runJest(dir, ['todoMultipleArgs.test.js']);
   expect(result.status).toBe(1);
   const {rest} = extractSummary(result.stderr);
   expect(rest).toMatchSnapshot();
 });
 
 test('shows error messages when called with invalid argument', () => {
-  const result = runJest(dir, ['todo_non_string.test.js']);
+  const result = runJest(dir, ['todoNonString.test.js']);
   expect(result.status).toBe(1);
   const {rest} = extractSummary(result.stderr);
   expect(rest).toMatchSnapshot();
diff --git a/e2e/__tests__/timeouts_legacy.test.js b/e2e/__tests__/timeoutsLegacy.test.js
similarity index 100%
rename from e2e/__tests__/timeouts_legacy.test.js
rename to e2e/__tests__/timeoutsLegacy.test.js
diff --git a/e2e/__tests__/timer_reset_mocks.test.js b/e2e/__tests__/timerResetMocks.test.js
similarity index 100%
rename from e2e/__tests__/timer_reset_mocks.test.js
rename to e2e/__tests__/timerResetMocks.test.js
diff --git a/e2e/__tests__/timer_use_real_timers.test.js b/e2e/__tests__/timerUseRealTimers.test.js
similarity index 100%
rename from e2e/__tests__/timer_use_real_timers.test.js
rename to e2e/__tests__/timerUseRealTimers.test.js
diff --git a/e2e/__tests__/to_match_inline_snapshot.test.js b/e2e/__tests__/toMatchInlineSnapshot.test.js
similarity index 99%
rename from e2e/__tests__/to_match_inline_snapshot.test.js
rename to e2e/__tests__/toMatchInlineSnapshot.test.js
index 6868193a92fb..3bd85ffedd34 100644
--- a/e2e/__tests__/to_match_inline_snapshot.test.js
+++ b/e2e/__tests__/toMatchInlineSnapshot.test.js
@@ -12,7 +12,7 @@ import path from 'path';
 import {cleanup, makeTemplate, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(__dirname, '../toMatchInlineSnapshot');
+const DIR = path.resolve(__dirname, '../to-match-inline-snapshot');
 const TESTS_DIR = path.resolve(DIR, '__tests__');
 
 const readFile = filename =>
diff --git a/e2e/__tests__/to_match_snapshot.test.js b/e2e/__tests__/toMatchSnapshot.test.js
similarity index 99%
rename from e2e/__tests__/to_match_snapshot.test.js
rename to e2e/__tests__/toMatchSnapshot.test.js
index cb60fdf9d474..5fd065d03259 100644
--- a/e2e/__tests__/to_match_snapshot.test.js
+++ b/e2e/__tests__/toMatchSnapshot.test.js
@@ -11,7 +11,7 @@ import path from 'path';
 import {cleanup, makeTemplate, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(__dirname, '../toMatchSnapshot');
+const DIR = path.resolve(__dirname, '../to-match-snapshot');
 const TESTS_DIR = path.resolve(DIR, '__tests__');
 
 beforeEach(() => cleanup(TESTS_DIR));
diff --git a/e2e/__tests__/to_throw_error_matching_inline_snapshot.test.js b/e2e/__tests__/toThrowErrorMatchingInlineSnapshot.test.js
similarity index 97%
rename from e2e/__tests__/to_throw_error_matching_inline_snapshot.test.js
rename to e2e/__tests__/toThrowErrorMatchingInlineSnapshot.test.js
index f8033e7e0ab5..e2bb075cd961 100644
--- a/e2e/__tests__/to_throw_error_matching_inline_snapshot.test.js
+++ b/e2e/__tests__/toThrowErrorMatchingInlineSnapshot.test.js
@@ -12,7 +12,10 @@ import fs from 'fs';
 import {cleanup, makeTemplate, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(__dirname, '../toThrowErrorMatchingInlineSnapshot');
+const DIR = path.resolve(
+  __dirname,
+  '../to-throw-error-matching-inline-snapshot',
+);
 const TESTS_DIR = path.resolve(DIR, '__tests__');
 
 const readFile = filename =>
diff --git a/e2e/__tests__/to_throw_error_matching_snapshot.test.js b/e2e/__tests__/toThrowErrorMatchingSnapshot.test.js
similarity index 97%
rename from e2e/__tests__/to_throw_error_matching_snapshot.test.js
rename to e2e/__tests__/toThrowErrorMatchingSnapshot.test.js
index 8bacbd5bffa2..bfcebc9c20c3 100644
--- a/e2e/__tests__/to_throw_error_matching_snapshot.test.js
+++ b/e2e/__tests__/toThrowErrorMatchingSnapshot.test.js
@@ -12,7 +12,7 @@ import fs from 'fs';
 import {cleanup, makeTemplate, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(__dirname, '../toThrowErrorMatchingSnapshot');
+const DIR = path.resolve(__dirname, '../to-throw-error-matching-snapshot');
 const TESTS_DIR = path.resolve(DIR, '__tests__');
 
 beforeEach(() => cleanup(TESTS_DIR));
diff --git a/e2e/__tests__/transform.test.js b/e2e/__tests__/transform.test.js
index 9e13d5438f78..56792bb98557 100644
--- a/e2e/__tests__/transform.test.js
+++ b/e2e/__tests__/transform.test.js
@@ -36,9 +36,9 @@ describe('babel-jest', () => {
     const {stdout} = runJest(dir, ['--coverage', '--no-cache'], {
       stripAnsi: true,
     });
-    expect(stdout).toMatch('Covered.js');
-    expect(stdout).not.toMatch('NotCovered.js');
-    expect(stdout).not.toMatch('ExcludedFromCoverage.js');
+    expect(stdout).toMatch('covered.js');
+    expect(stdout).not.toMatch('notCovered.js');
+    expect(stdout).not.toMatch('excludedFromCoverage.js');
     // coverage result should not change
     expect(stdout).toMatchSnapshot();
   });
@@ -60,7 +60,7 @@ describe('no babel-jest', () => {
 
   test('fails with syntax error on flow types', () => {
     const {stderr} = runJest(tempDir, ['--no-cache', '--no-watchman']);
-    expect(stderr).toMatch(/FAIL.*fails_with_syntax_error/);
+    expect(stderr).toMatch(/FAIL.*failsWithSyntaxError/);
     expect(stderr).toMatch('Unexpected token');
   });
 
@@ -70,8 +70,8 @@ describe('no babel-jest', () => {
       ['--no-cache', '--coverage', '--no-watchman'],
       {stripAnsi: true},
     );
-    expect(stdout).toMatch('Covered.js');
-    expect(stdout).not.toMatch('ExcludedFromCoverage.js');
+    expect(stdout).toMatch('covered.js');
+    expect(stdout).not.toMatch('excludedFromCoverage.js');
     // coverage result should not change
     expect(stdout).toMatchSnapshot();
   });
diff --git a/e2e/__tests__/transform-linked-modules.test.js b/e2e/__tests__/transformLinkedModules.test.js
similarity index 100%
rename from e2e/__tests__/transform-linked-modules.test.js
rename to e2e/__tests__/transformLinkedModules.test.js
diff --git a/e2e/__tests__/typescript_coverage.test.js b/e2e/__tests__/typescriptCoverage.test.js
similarity index 100%
rename from e2e/__tests__/typescript_coverage.test.js
rename to e2e/__tests__/typescriptCoverage.test.js
diff --git a/e2e/__tests__/unexpected-token.test.js b/e2e/__tests__/unexpectedToken.test.js
similarity index 100%
rename from e2e/__tests__/unexpected-token.test.js
rename to e2e/__tests__/unexpectedToken.test.js
diff --git a/e2e/__tests__/use_stderr.test.js b/e2e/__tests__/useStderr.test.js
similarity index 94%
rename from e2e/__tests__/use_stderr.test.js
rename to e2e/__tests__/useStderr.test.js
index f9da1cd3b64d..e7e217c7f027 100644
--- a/e2e/__tests__/use_stderr.test.js
+++ b/e2e/__tests__/useStderr.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import path from 'path';
 import {cleanup, writeFiles} from '../Utils';
 
-const DIR = path.resolve(os.tmpdir(), 'use_stderr_test');
+const DIR = path.resolve(os.tmpdir(), 'use-stderr-test');
 
 beforeEach(() => cleanup(DIR));
 afterEach(() => cleanup(DIR));
diff --git a/e2e/__tests__/version.test.js b/e2e/__tests__/version.test.js
index ead7dd6a78a2..9150d2a9425b 100644
--- a/e2e/__tests__/version.test.js
+++ b/e2e/__tests__/version.test.js
@@ -14,7 +14,7 @@ import os from 'os';
 import {cleanup, writeFiles} from '../Utils';
 import runJest from '../runJest';
 
-const DIR = path.resolve(os.tmpdir(), 'version_test');
+const DIR = path.resolve(os.tmpdir(), 'version-test');
 
 beforeEach(() => cleanup(DIR));
 afterAll(() => cleanup(DIR));
diff --git a/e2e/__tests__/watch_mode_only_failed.test.js b/e2e/__tests__/watchModeOnlyFailed.test.js
similarity index 95%
rename from e2e/__tests__/watch_mode_only_failed.test.js
rename to e2e/__tests__/watchModeOnlyFailed.test.js
index 1d4d3861aeb3..09e50945c8ad 100644
--- a/e2e/__tests__/watch_mode_only_failed.test.js
+++ b/e2e/__tests__/watchModeOnlyFailed.test.js
@@ -13,7 +13,7 @@ import {cleanup, extractSummaries, writeFiles} from '../Utils';
 import os from 'os';
 import runJest from '../runJest';
 
-const DIR = path.resolve(os.tmpdir(), 'watch_mode_only_failed');
+const DIR = path.resolve(os.tmpdir(), 'watch-mode-only-failed');
 const pluginPath = path.resolve(__dirname, '../MockStdinWatchPlugin');
 
 beforeEach(() => cleanup(DIR));
diff --git a/e2e/__tests__/watch_mode_patterns.test.js b/e2e/__tests__/watchModePatterns.test.js
similarity index 97%
rename from e2e/__tests__/watch_mode_patterns.test.js
rename to e2e/__tests__/watchModePatterns.test.js
index 142aef1accde..66a3cfb1442a 100644
--- a/e2e/__tests__/watch_mode_patterns.test.js
+++ b/e2e/__tests__/watchModePatterns.test.js
@@ -13,7 +13,7 @@ import {cleanup, extractSummaries, writeFiles} from '../Utils';
 import os from 'os';
 import runJest from '../runJest';
 
-const DIR = path.resolve(os.tmpdir(), 'watch_mode_patterns');
+const DIR = path.resolve(os.tmpdir(), 'watch-mode-patterns');
 const pluginPath = path.resolve(__dirname, '../MockStdinWatchPlugin');
 
 beforeEach(() => cleanup(DIR));
diff --git a/e2e/__tests__/watch_mode_update_snapshot.test.js b/e2e/__tests__/watchModeUpdateSnapshot.test.js
similarity index 96%
rename from e2e/__tests__/watch_mode_update_snapshot.test.js
rename to e2e/__tests__/watchModeUpdateSnapshot.test.js
index b1845d21f416..872a9e2c13a7 100644
--- a/e2e/__tests__/watch_mode_update_snapshot.test.js
+++ b/e2e/__tests__/watchModeUpdateSnapshot.test.js
@@ -13,7 +13,7 @@ import {cleanup, extractSummaries, writeFiles} from '../Utils';
 import os from 'os';
 import runJest from '../runJest';
 
-const DIR = path.resolve(os.tmpdir(), 'watch_mode_update_snapshot');
+const DIR = path.resolve(os.tmpdir(), 'watch-mode-update-snapshot');
 const pluginPath = path.resolve(__dirname, '../MockStdinWatchPlugin');
 
 beforeEach(() => cleanup(DIR));
diff --git a/e2e/babel-plugin-jest-hoist/__tests__/integration_automock_off.test.js b/e2e/babel-plugin-jest-hoist/__tests__/integrationAutomockOff.test.js
similarity index 100%
rename from e2e/babel-plugin-jest-hoist/__tests__/integration_automock_off.test.js
rename to e2e/babel-plugin-jest-hoist/__tests__/integrationAutomockOff.test.js
diff --git a/e2e/bad-source-map/__tests__/bad-source-map.js b/e2e/bad-source-map/__tests__/badSourceMap.js
similarity index 88%
rename from e2e/bad-source-map/__tests__/bad-source-map.js
rename to e2e/bad-source-map/__tests__/badSourceMap.js
index 684a0e5775ea..f7e209e4f358 100644
--- a/e2e/bad-source-map/__tests__/bad-source-map.js
+++ b/e2e/bad-source-map/__tests__/badSourceMap.js
@@ -12,4 +12,4 @@ it('should fail with a proper stacktrace', () => {
   expect(true).toBe(false);
 });
 
-//# sourceMappingURL=bad-source-map.js.map
+//# sourceMappingURL=badSourceMap.js.map
diff --git a/e2e/bad-source-map/__tests__/bad-source-map.js.map b/e2e/bad-source-map/__tests__/badSourceMap.js.map
similarity index 54%
rename from e2e/bad-source-map/__tests__/bad-source-map.js.map
rename to e2e/bad-source-map/__tests__/badSourceMap.js.map
index 6d7809e16409..dbe7e3818e46 100644
--- a/e2e/bad-source-map/__tests__/bad-source-map.js.map
+++ b/e2e/bad-source-map/__tests__/badSourceMap.js.map
@@ -1 +1 @@
-{"version":3,"file":"bad-source-map.js","sources":["dummy:///./index.js"],"sourcesContent":[""],"mappings":";AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;;;;;;;;;;;;ACzEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;;;;;;;;;;;;ACRA;;;;;;;;;;;;;;;;A","sourceRoot":""}
+{"version":3,"file":"badSourceMap.js","sources":["dummy:///./index.js"],"sourcesContent":[""],"mappings":";AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;;;;;;;;;;;;ACzEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;;;;;;;;;;;;ACRA;;;;;;;;;;;;;;;;A","sourceRoot":""}
diff --git a/e2e/before-all-filtered/__tests__/before-all-filtered.test.js b/e2e/before-all-filtered/__tests__/beforeAllFiltered.test.js
similarity index 100%
rename from e2e/before-all-filtered/__tests__/before-all-filtered.test.js
rename to e2e/before-all-filtered/__tests__/beforeAllFiltered.test.js
diff --git a/e2e/before-each-queue/__tests__/before-each-queue.test.js b/e2e/before-each-queue/__tests__/beforeEachQueue.test.js
similarity index 100%
rename from e2e/before-each-queue/__tests__/before-each-queue.test.js
rename to e2e/before-each-queue/__tests__/beforeEachQueue.test.js
diff --git a/e2e/browser-support/browser-test.js b/e2e/browser-support/browserTest.js
similarity index 100%
rename from e2e/browser-support/browser-test.js
rename to e2e/browser-support/browserTest.js
diff --git a/e2e/clear-cache/__tests__/clear_cache.test.js b/e2e/clear-cache/__tests__/clearCache.test.js
similarity index 100%
rename from e2e/clear-cache/__tests__/clear_cache.test.js
rename to e2e/clear-cache/__tests__/clearCache.test.js
diff --git a/e2e/compare-dom-nodes/__tests__/failed-assertion.js b/e2e/compare-dom-nodes/__tests__/failedAssertion.js
similarity index 100%
rename from e2e/compare-dom-nodes/__tests__/failed-assertion.js
rename to e2e/compare-dom-nodes/__tests__/failedAssertion.js
diff --git a/e2e/coverage-remapping/__tests__/covered-test.ts b/e2e/coverage-remapping/__tests__/coveredTest.ts
similarity index 100%
rename from e2e/coverage-remapping/__tests__/covered-test.ts
rename to e2e/coverage-remapping/__tests__/coveredTest.ts
diff --git a/e2e/coverage-remapping/package.json b/e2e/coverage-remapping/package.json
index 6a0bc877eed1..293ece57d892 100644
--- a/e2e/coverage-remapping/package.json
+++ b/e2e/coverage-remapping/package.json
@@ -2,7 +2,7 @@
   "jest": {
     "rootDir": "./",
     "transform": {
-      "^.+\\.(ts|js)$": "<rootDir>/TypescriptPreprocessor.js"
+      "^.+\\.(ts|js)$": "<rootDir>/typescriptPreprocessor.js"
     },
     "testRegex": "/__tests__/.*\\.(ts|tsx|js)$",
     "testEnvironment": "node",
diff --git a/e2e/coverage-remapping/TypescriptPreprocessor.js b/e2e/coverage-remapping/typescriptPreprocessor.js
similarity index 100%
rename from e2e/coverage-remapping/TypescriptPreprocessor.js
rename to e2e/coverage-remapping/typescriptPreprocessor.js
diff --git a/e2e/coverage-report/__mocks__/SumDependency.js b/e2e/coverage-report/__mocks__/sumDependency.js
similarity index 100%
rename from e2e/coverage-report/__mocks__/SumDependency.js
rename to e2e/coverage-report/__mocks__/sumDependency.js
diff --git a/e2e/coverage-report/__tests__/Sum.test.js b/e2e/coverage-report/__tests__/sum.test.js
similarity index 81%
rename from e2e/coverage-report/__tests__/Sum.test.js
rename to e2e/coverage-report/__tests__/sum.test.js
index 5700ad4e3f4b..21e90c7698b8 100644
--- a/e2e/coverage-report/__tests__/Sum.test.js
+++ b/e2e/coverage-report/__tests__/sum.test.js
@@ -6,9 +6,9 @@
  */
 'use strict';
 
-jest.mock('../SumDependency.js'); // call mock explicitly
+jest.mock('../sumDependency.js'); // call mock explicitly
 
-const {sum} = require('../Sum');
+const {sum} = require('../sum');
 
 if (!global.setup) {
   throw new Error('setup.js was not called.');
diff --git a/e2e/coverage-report/cached-duplicates/a/__tests__/Identical.test.js b/e2e/coverage-report/cached-duplicates/a/__tests__/identical.test.js
similarity index 89%
rename from e2e/coverage-report/cached-duplicates/a/__tests__/Identical.test.js
rename to e2e/coverage-report/cached-duplicates/a/__tests__/identical.test.js
index b8bf2bd79f6b..9b92ce339ddf 100644
--- a/e2e/coverage-report/cached-duplicates/a/__tests__/Identical.test.js
+++ b/e2e/coverage-report/cached-duplicates/a/__tests__/identical.test.js
@@ -6,7 +6,7 @@
  */
 'use strict';
 
-const {sum} = require('../Identical');
+const {sum} = require('../identical');
 
 describe('sum', () => {
   it('adds numbers', () => {
diff --git a/e2e/coverage-report/cached-duplicates/a/Identical.js b/e2e/coverage-report/cached-duplicates/a/identical.js
similarity index 100%
rename from e2e/coverage-report/cached-duplicates/a/Identical.js
rename to e2e/coverage-report/cached-duplicates/a/identical.js
diff --git a/e2e/coverage-report/cached-duplicates/b/__tests__/Identical.test.js b/e2e/coverage-report/cached-duplicates/b/__tests__/identical.test.js
similarity index 89%
rename from e2e/coverage-report/cached-duplicates/b/__tests__/Identical.test.js
rename to e2e/coverage-report/cached-duplicates/b/__tests__/identical.test.js
index b8bf2bd79f6b..9b92ce339ddf 100644
--- a/e2e/coverage-report/cached-duplicates/b/__tests__/Identical.test.js
+++ b/e2e/coverage-report/cached-duplicates/b/__tests__/identical.test.js
@@ -6,7 +6,7 @@
  */
 'use strict';
 
-const {sum} = require('../Identical');
+const {sum} = require('../identical');
 
 describe('sum', () => {
   it('adds numbers', () => {
diff --git a/e2e/coverage-report/cached-duplicates/b/Identical.js b/e2e/coverage-report/cached-duplicates/b/identical.js
similarity index 100%
rename from e2e/coverage-report/cached-duplicates/b/Identical.js
rename to e2e/coverage-report/cached-duplicates/b/identical.js
diff --git a/e2e/coverage-report/OtherFile.js b/e2e/coverage-report/otherFile.js
similarity index 100%
rename from e2e/coverage-report/OtherFile.js
rename to e2e/coverage-report/otherFile.js
diff --git a/e2e/coverage-report/Sum.js b/e2e/coverage-report/sum.js
similarity index 85%
rename from e2e/coverage-report/Sum.js
rename to e2e/coverage-report/sum.js
index 3279ffd7df4c..27e339dbed42 100644
--- a/e2e/coverage-report/Sum.js
+++ b/e2e/coverage-report/sum.js
@@ -5,8 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-require('./SumDependency.js');
-require('./OtherFile');
+require('./sumDependency.js');
+require('./otherFile');
 
 const uncoveredFunction = () => 1 + 'abc';
 
diff --git a/e2e/coverage-report/SumDependency.js b/e2e/coverage-report/sumDependency.js
similarity index 100%
rename from e2e/coverage-report/SumDependency.js
rename to e2e/coverage-report/sumDependency.js
diff --git a/e2e/coverage-transform-instrumented/__tests__/covered-test.js b/e2e/coverage-transform-instrumented/__tests__/coveredTest.js
similarity index 100%
rename from e2e/coverage-transform-instrumented/__tests__/covered-test.js
rename to e2e/coverage-transform-instrumented/__tests__/coveredTest.js
diff --git a/e2e/coverage-transform-instrumented/package.json b/e2e/coverage-transform-instrumented/package.json
index f4ed2ef57648..e4356a9f2ea9 100644
--- a/e2e/coverage-transform-instrumented/package.json
+++ b/e2e/coverage-transform-instrumented/package.json
@@ -2,7 +2,7 @@
   "jest": {
     "rootDir": "./",
     "transform": {
-      "^.+\\.(js)$": "<rootDir>/Preprocessor.js"
+      "^.+\\.(js)$": "<rootDir>/preprocessor.js"
     },
     "testRegex": "/__tests__/.*\\.(js)$",
     "testEnvironment": "node",
diff --git a/e2e/coverage-transform-instrumented/Preprocessor.js b/e2e/coverage-transform-instrumented/preprocessor.js
similarity index 100%
rename from e2e/coverage-transform-instrumented/Preprocessor.js
rename to e2e/coverage-transform-instrumented/preprocessor.js
diff --git a/e2e/custom-matcher-stack-trace/__tests__/custom_matcher.test.js b/e2e/custom-matcher-stack-trace/__tests__/customMatcher.test.js
similarity index 100%
rename from e2e/custom-matcher-stack-trace/__tests__/custom_matcher.test.js
rename to e2e/custom-matcher-stack-trace/__tests__/customMatcher.test.js
diff --git a/e2e/custom-reporters/__tests__/add_fail.test.js b/e2e/custom-reporters/__tests__/addFail.test.js
similarity index 100%
rename from e2e/custom-reporters/__tests__/add_fail.test.js
rename to e2e/custom-reporters/__tests__/addFail.test.js
diff --git a/e2e/custom-resolver/__mocks__/manual-mock.js b/e2e/custom-resolver/__mocks__/manualMock.js
similarity index 100%
rename from e2e/custom-resolver/__mocks__/manual-mock.js
rename to e2e/custom-resolver/__mocks__/manualMock.js
diff --git a/e2e/custom-resolver/__tests__/custom-resolver.test.js b/e2e/custom-resolver/__tests__/customResolver.test.js
similarity index 88%
rename from e2e/custom-resolver/__tests__/custom-resolver.test.js
rename to e2e/custom-resolver/__tests__/customResolver.test.js
index 364c449541ab..9e6911f35f62 100644
--- a/e2e/custom-resolver/__tests__/custom-resolver.test.js
+++ b/e2e/custom-resolver/__tests__/customResolver.test.js
@@ -24,7 +24,7 @@ test('should work with automock', () => {
 });
 
 test('should allow manual mocks to make require calls through the resolver', () => {
-  jest.mock('../manual-mock');
+  jest.mock('../manualMock');
 
-  expect(require('../manual-mock')).toEqual('bar');
+  expect(require('../manualMock')).toEqual('bar');
 });
diff --git a/e2e/custom-resolver/fake-regenerator.js b/e2e/custom-resolver/fakeRegenerator.js
similarity index 100%
rename from e2e/custom-resolver/fake-regenerator.js
rename to e2e/custom-resolver/fakeRegenerator.js
diff --git a/e2e/custom-resolver/manual-mock.js b/e2e/custom-resolver/manualMock.js
similarity index 100%
rename from e2e/custom-resolver/manual-mock.js
rename to e2e/custom-resolver/manualMock.js
diff --git a/e2e/custom-resolver/resolver.js b/e2e/custom-resolver/resolver.js
index 255dbe073d0c..f854ce959e6b 100644
--- a/e2e/custom-resolver/resolver.js
+++ b/e2e/custom-resolver/resolver.js
@@ -7,7 +7,7 @@ const {
 const exportedModules = new Map([
   ['foo', 'foo'],
   ['bar', 'bar'],
-  ['regenerator-runtime/runtime', 'fake-regenerator'],
+  ['regenerator-runtime/runtime', 'fakeRegenerator'],
 ]);
 
 module.exports = (name, options) => {
diff --git a/e2e/each/__tests__/describe-only.test.js b/e2e/each/__tests__/describeOnly.test.js
similarity index 100%
rename from e2e/each/__tests__/describe-only.test.js
rename to e2e/each/__tests__/describeOnly.test.js
diff --git a/e2e/each/__tests__/each-exception.test.js b/e2e/each/__tests__/eachException.test.js
similarity index 100%
rename from e2e/each/__tests__/each-exception.test.js
rename to e2e/each/__tests__/eachException.test.js
diff --git a/e2e/each/__tests__/each-only.test.js b/e2e/each/__tests__/eachOnly.test.js
similarity index 100%
rename from e2e/each/__tests__/each-only.test.js
rename to e2e/each/__tests__/eachOnly.test.js
diff --git a/e2e/each/__tests__/each-skip.test.js b/e2e/each/__tests__/eachSkip.test.js
similarity index 100%
rename from e2e/each/__tests__/each-skip.test.js
rename to e2e/each/__tests__/eachSkip.test.js
diff --git a/e2e/empty-describe-with-hooks/__tests__/hook-in-describe-with-skipped-test.test.js b/e2e/empty-describe-with-hooks/__tests__/hookInDescribeWithSkippedTest.test.js
similarity index 100%
rename from e2e/empty-describe-with-hooks/__tests__/hook-in-describe-with-skipped-test.test.js
rename to e2e/empty-describe-with-hooks/__tests__/hookInDescribeWithSkippedTest.test.js
diff --git a/e2e/empty-describe-with-hooks/__tests__/hook-in-empty-describe.test.js b/e2e/empty-describe-with-hooks/__tests__/hookInEmptyDescribe.test.js
similarity index 100%
rename from e2e/empty-describe-with-hooks/__tests__/hook-in-empty-describe.test.js
rename to e2e/empty-describe-with-hooks/__tests__/hookInEmptyDescribe.test.js
diff --git a/e2e/empty-describe-with-hooks/__tests__/hook-in-empty-nested-describe.test.js b/e2e/empty-describe-with-hooks/__tests__/hookInEmptyNestedDescribe.test.js
similarity index 100%
rename from e2e/empty-describe-with-hooks/__tests__/hook-in-empty-nested-describe.test.js
rename to e2e/empty-describe-with-hooks/__tests__/hookInEmptyNestedDescribe.test.js
diff --git a/e2e/empty-describe-with-hooks/__tests__/multiple-hooks-in-empty-describe.test.js b/e2e/empty-describe-with-hooks/__tests__/multipleHooksInEmptyDescribe.test.js
similarity index 100%
rename from e2e/empty-describe-with-hooks/__tests__/multiple-hooks-in-empty-describe.test.js
rename to e2e/empty-describe-with-hooks/__tests__/multipleHooksInEmptyDescribe.test.js
diff --git a/e2e/empty-suite-error/__tests__/empty_suite.test.js b/e2e/empty-suite-error/__tests__/emptySuite.test.js
similarity index 100%
rename from e2e/empty-suite-error/__tests__/empty_suite.test.js
rename to e2e/empty-suite-error/__tests__/emptySuite.test.js
diff --git a/e2e/error-on-deprecated/__tests__/DEFAULT_TIMEOUT_INTERVAL.test.js b/e2e/error-on-deprecated/__tests__/defaultTimeoutInterval.test.js
similarity index 87%
rename from e2e/error-on-deprecated/__tests__/DEFAULT_TIMEOUT_INTERVAL.test.js
rename to e2e/error-on-deprecated/__tests__/defaultTimeoutInterval.test.js
index 4e5bdf377024..f411f5075ee6 100644
--- a/e2e/error-on-deprecated/__tests__/DEFAULT_TIMEOUT_INTERVAL.test.js
+++ b/e2e/error-on-deprecated/__tests__/defaultTimeoutInterval.test.js
@@ -6,7 +6,7 @@
  */
 'use strict';
 
-test('DEFAULT_TIMEOUT_INTERVAL', () => {
+test('Default Timeout Interval', () => {
   jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000;
   expect(true).toBe(true);
 });
diff --git a/e2e/failures/__tests__/__snapshots__/snapshot_named.test.js.snap b/e2e/failures/__tests__/__snapshots__/snapshotNamed.test.js.snap
similarity index 100%
rename from e2e/failures/__tests__/__snapshots__/snapshot_named.test.js.snap
rename to e2e/failures/__tests__/__snapshots__/snapshotNamed.test.js.snap
diff --git a/e2e/failures/__tests__/assertion_count.test.js b/e2e/failures/__tests__/assertionCount.test.js
similarity index 100%
rename from e2e/failures/__tests__/assertion_count.test.js
rename to e2e/failures/__tests__/assertionCount.test.js
diff --git a/e2e/failures/__tests__/node_assertion_error.test.js b/e2e/failures/__tests__/assertionError.test.js
similarity index 100%
rename from e2e/failures/__tests__/node_assertion_error.test.js
rename to e2e/failures/__tests__/assertionError.test.js
diff --git a/e2e/failures/__tests__/async_failures.test.js b/e2e/failures/__tests__/asyncFailures.test.js
similarity index 100%
rename from e2e/failures/__tests__/async_failures.test.js
rename to e2e/failures/__tests__/asyncFailures.test.js
diff --git a/e2e/failures/__tests__/during_tests.test.js b/e2e/failures/__tests__/duringTests.test.js
similarity index 100%
rename from e2e/failures/__tests__/during_tests.test.js
rename to e2e/failures/__tests__/duringTests.test.js
diff --git a/e2e/failures/__tests__/snapshot_named.test.js b/e2e/failures/__tests__/snapshotNamed.test.js
similarity index 100%
rename from e2e/failures/__tests__/snapshot_named.test.js
rename to e2e/failures/__tests__/snapshotNamed.test.js
diff --git a/e2e/failures/__tests__/test_macro.test.js b/e2e/failures/__tests__/testMacro.test.js
similarity index 100%
rename from e2e/failures/__tests__/test_macro.test.js
rename to e2e/failures/__tests__/testMacro.test.js
diff --git a/e2e/failures/__tests__/throw_number.test.js b/e2e/failures/__tests__/throwNumber.test.js
similarity index 100%
rename from e2e/failures/__tests__/throw_number.test.js
rename to e2e/failures/__tests__/throwNumber.test.js
diff --git a/e2e/failures/__tests__/throw_object.test.js b/e2e/failures/__tests__/throwObject.test.js
similarity index 100%
rename from e2e/failures/__tests__/throw_object.test.js
rename to e2e/failures/__tests__/throwObject.test.js
diff --git a/e2e/failures/__tests__/throw_string.test.js b/e2e/failures/__tests__/throwString.test.js
similarity index 100%
rename from e2e/failures/__tests__/throw_string.test.js
rename to e2e/failures/__tests__/throwString.test.js
diff --git a/e2e/generator-mock/__tests__/generator_mock.test.js b/e2e/generator-mock/__tests__/generatorMock.test.js
similarity index 100%
rename from e2e/generator-mock/__tests__/generator_mock.test.js
rename to e2e/generator-mock/__tests__/generatorMock.test.js
diff --git a/e2e/global-setup/custom_tests_dir/pass.test.js b/e2e/global-setup/custom-tests-dir/pass.test.js
similarity index 100%
rename from e2e/global-setup/custom_tests_dir/pass.test.js
rename to e2e/global-setup/custom-tests-dir/pass.test.js
diff --git a/e2e/global-setup/invalid_setup.js b/e2e/global-setup/invalidSetup.js
similarity index 100%
rename from e2e/global-setup/invalid_setup.js
rename to e2e/global-setup/invalidSetup.js
diff --git a/e2e/global-setup/setup-with-config.js b/e2e/global-setup/setupWithConfig.js
similarity index 100%
rename from e2e/global-setup/setup-with-config.js
rename to e2e/global-setup/setupWithConfig.js
diff --git a/e2e/global-teardown/custom_tests_dir/pass.test.js b/e2e/global-teardown/custom-tests-dir/pass.test.js
similarity index 100%
rename from e2e/global-teardown/custom_tests_dir/pass.test.js
rename to e2e/global-teardown/custom-tests-dir/pass.test.js
diff --git a/e2e/global-teardown/invalid_teardown.js b/e2e/global-teardown/invalidTeardown.js
similarity index 100%
rename from e2e/global-teardown/invalid_teardown.js
rename to e2e/global-teardown/invalidTeardown.js
diff --git a/e2e/global-teardown/teardown-with-config.js b/e2e/global-teardown/teardownWithConfig.js
similarity index 100%
rename from e2e/global-teardown/teardown-with-config.js
rename to e2e/global-teardown/teardownWithConfig.js
diff --git a/e2e/jasmine-async/__tests__/async_test_fails.test.js b/e2e/jasmine-async/__tests__/asyncTestFails.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/async_test_fails.test.js
rename to e2e/jasmine-async/__tests__/asyncTestFails.test.js
diff --git a/e2e/jasmine-async/__tests__/pending_in_promise.test.js b/e2e/jasmine-async/__tests__/pendingInPromise.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/pending_in_promise.test.js
rename to e2e/jasmine-async/__tests__/pendingInPromise.test.js
diff --git a/e2e/jasmine-async/__tests__/promise_after_all.test.js b/e2e/jasmine-async/__tests__/promiseAfterAll.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/promise_after_all.test.js
rename to e2e/jasmine-async/__tests__/promiseAfterAll.test.js
diff --git a/e2e/jasmine-async/__tests__/promise_after_each.test.js b/e2e/jasmine-async/__tests__/promiseAfterEach.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/promise_after_each.test.js
rename to e2e/jasmine-async/__tests__/promiseAfterEach.test.js
diff --git a/e2e/jasmine-async/__tests__/promise_before_all.test.js b/e2e/jasmine-async/__tests__/promiseBeforeAll.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/promise_before_all.test.js
rename to e2e/jasmine-async/__tests__/promiseBeforeAll.test.js
diff --git a/e2e/jasmine-async/__tests__/promise_before_each.test.js b/e2e/jasmine-async/__tests__/promiseBeforeEach.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/promise_before_each.test.js
rename to e2e/jasmine-async/__tests__/promiseBeforeEach.test.js
diff --git a/e2e/jasmine-async/__tests__/promise_fit.test.js b/e2e/jasmine-async/__tests__/promiseFit.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/promise_fit.test.js
rename to e2e/jasmine-async/__tests__/promiseFit.test.js
diff --git a/e2e/jasmine-async/__tests__/promise_it.test.js b/e2e/jasmine-async/__tests__/promiseIt.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/promise_it.test.js
rename to e2e/jasmine-async/__tests__/promiseIt.test.js
diff --git a/e2e/jasmine-async/__tests__/promise_xit.test.js b/e2e/jasmine-async/__tests__/promiseXit.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/promise_xit.test.js
rename to e2e/jasmine-async/__tests__/promiseXit.test.js
diff --git a/e2e/jasmine-async/__tests__/returning_values.test.js b/e2e/jasmine-async/__tests__/returningValues.test.js
similarity index 100%
rename from e2e/jasmine-async/__tests__/returning_values.test.js
rename to e2e/jasmine-async/__tests__/returningValues.test.js
diff --git a/e2e/module-name-mapper-correct-config/__mocks__/style_mock.js b/e2e/module-name-mapper-correct-config/__mocks__/styleMock.js
similarity index 100%
rename from e2e/module-name-mapper-correct-config/__mocks__/style_mock.js
rename to e2e/module-name-mapper-correct-config/__mocks__/styleMock.js
diff --git a/e2e/module-name-mapper-correct-config/package.json b/e2e/module-name-mapper-correct-config/package.json
index 52a664c7c235..bae54df851fe 100644
--- a/e2e/module-name-mapper-correct-config/package.json
+++ b/e2e/module-name-mapper-correct-config/package.json
@@ -1,7 +1,7 @@
 {
   "jest": {
     "moduleNameMapper": {
-      "\\.(css|less)$": "./__mocks__/style_mock.js"
+      "\\.(css|less)$": "./__mocks__/styleMock.js"
     }
   }
 }
diff --git a/e2e/module_parent_null_in_test/__tests__/index.js b/e2e/module-parent-null-in-test/__tests__/index.js
similarity index 100%
rename from e2e/module_parent_null_in_test/__tests__/index.js
rename to e2e/module-parent-null-in-test/__tests__/index.js
diff --git a/e2e/module_parent_null_in_test/package.json b/e2e/module-parent-null-in-test/package.json
similarity index 100%
rename from e2e/module_parent_null_in_test/package.json
rename to e2e/module-parent-null-in-test/package.json
diff --git a/e2e/multi-project-config-root/bar/__tests__/boggus-bar.test.js b/e2e/multi-project-config-root/bar/__tests__/boggusBar.test.js
similarity index 100%
rename from e2e/multi-project-config-root/bar/__tests__/boggus-bar.test.js
rename to e2e/multi-project-config-root/bar/__tests__/boggusBar.test.js
diff --git a/e2e/multi-project-config-root/foo/__tests__/boggus-foo.test.js b/e2e/multi-project-config-root/foo/__tests__/boggusFoo.test.js
similarity index 100%
rename from e2e/multi-project-config-root/foo/__tests__/boggus-foo.test.js
rename to e2e/multi-project-config-root/foo/__tests__/boggusFoo.test.js
diff --git a/e2e/native-async-mock/__tests__/native_async_mock.test.js b/e2e/native-async-mock/__tests__/nativeAsyncMock.test.js
similarity index 100%
rename from e2e/native-async-mock/__tests__/native_async_mock.test.js
rename to e2e/native-async-mock/__tests__/nativeAsyncMock.test.js
diff --git a/e2e/nested-event-loop/__tests__/nested_event_loop.test.js b/e2e/nested-event-loop/__tests__/nestedEventLoop.test.js
similarity index 100%
rename from e2e/nested-event-loop/__tests__/nested_event_loop.test.js
rename to e2e/nested-event-loop/__tests__/nestedEventLoop.test.js
diff --git a/e2e/node-path/__tests__/node_path.test.js b/e2e/node-path/__tests__/nodePath.test.js
similarity index 100%
rename from e2e/node-path/__tests__/node_path.test.js
rename to e2e/node-path/__tests__/nodePath.test.js
diff --git a/e2e/regex-(char-in-path/__tests__/regex_(char_in_path.test.js b/e2e/regex-(char-in-path/__tests__/regexCharInPath.test.js
similarity index 100%
rename from e2e/regex-(char-in-path/__tests__/regex_(char_in_path.test.js
rename to e2e/regex-(char-in-path/__tests__/regexCharInPath.test.js
diff --git a/e2e/require-after-teardown/__tests__/late-require.test.js b/e2e/require-after-teardown/__tests__/lateRequire.test.js
similarity index 100%
rename from e2e/require-after-teardown/__tests__/late-require.test.js
rename to e2e/require-after-teardown/__tests__/lateRequire.test.js
diff --git a/e2e/reset_modules/__tests__/reset_modules.test.js b/e2e/reset-modules/__tests__/resetModules.test.js
similarity index 100%
rename from e2e/reset_modules/__tests__/reset_modules.test.js
rename to e2e/reset-modules/__tests__/resetModules.test.js
diff --git a/e2e/reset_modules/package.json b/e2e/reset-modules/package.json
similarity index 100%
rename from e2e/reset_modules/package.json
rename to e2e/reset-modules/package.json
diff --git a/e2e/resolve-get-paths/__tests__/resolve-get-paths.test.js b/e2e/resolve-get-paths/__tests__/resolveGetPaths.test.js
similarity index 100%
rename from e2e/resolve-get-paths/__tests__/resolve-get-paths.test.js
rename to e2e/resolve-get-paths/__tests__/resolveGetPaths.test.js
diff --git a/e2e/resolve_no_extensions/__tests__/test.js b/e2e/resolve-no-extensions/__tests__/test.js
similarity index 100%
rename from e2e/resolve_no_extensions/__tests__/test.js
rename to e2e/resolve-no-extensions/__tests__/test.js
diff --git a/e2e/resolve_no_extensions/babel.config.js b/e2e/resolve-no-extensions/babel.config.js
similarity index 100%
rename from e2e/resolve_no_extensions/babel.config.js
rename to e2e/resolve-no-extensions/babel.config.js
diff --git a/e2e/resolve_no_extensions/index.js b/e2e/resolve-no-extensions/index.js
similarity index 100%
rename from e2e/resolve_no_extensions/index.js
rename to e2e/resolve-no-extensions/index.js
diff --git a/e2e/resolve_no_extensions/package.json b/e2e/resolve-no-extensions/package.json
similarity index 100%
rename from e2e/resolve_no_extensions/package.json
rename to e2e/resolve-no-extensions/package.json
diff --git a/e2e/resolve_no_extensions/some-json-file.json b/e2e/resolve-no-extensions/some-json-file.json
similarity index 100%
rename from e2e/resolve_no_extensions/some-json-file.json
rename to e2e/resolve-no-extensions/some-json-file.json
diff --git a/e2e/resolve-with-paths/__tests__/resolve-with-paths.test.js b/e2e/resolve-with-paths/__tests__/resolveWithPaths.test.js
similarity index 100%
rename from e2e/resolve-with-paths/__tests__/resolve-with-paths.test.js
rename to e2e/resolve-with-paths/__tests__/resolveWithPaths.test.js
diff --git a/e2e/runtime-internal-module-registry/__tests__/runtime_internal_module_registry.test.js b/e2e/runtime-internal-module-registry/__tests__/runtimeInternalModuleRegistry.test.js
similarity index 100%
rename from e2e/runtime-internal-module-registry/__tests__/runtime_internal_module_registry.test.js
rename to e2e/runtime-internal-module-registry/__tests__/runtimeInternalModuleRegistry.test.js
diff --git a/e2e/set-immediate/__tests__/set_immediate.test.js b/e2e/set-immediate/__tests__/setImmediate.test.js
similarity index 100%
rename from e2e/set-immediate/__tests__/set_immediate.test.js
rename to e2e/set-immediate/__tests__/setImmediate.test.js
diff --git a/e2e/setup-files-after-env-config/__tests__/runner_patch.test.js b/e2e/setup-files-after-env-config/__tests__/runnerPatch.test.js
similarity index 100%
rename from e2e/setup-files-after-env-config/__tests__/runner_patch.test.js
rename to e2e/setup-files-after-env-config/__tests__/runnerPatch.test.js
diff --git a/e2e/setup-files-after-env-config/setup_hooks_into_runner.js b/e2e/setup-files-after-env-config/setupHooksIntoRunner.js
similarity index 100%
rename from e2e/setup-files-after-env-config/setup_hooks_into_runner.js
rename to e2e/setup-files-after-env-config/setupHooksIntoRunner.js
diff --git a/e2e/snapshot-escape/__tests__/snapshot_escape_regex.js b/e2e/snapshot-escape/__tests__/snapshotEscapeRegex.js
similarity index 100%
rename from e2e/snapshot-escape/__tests__/snapshot_escape_regex.js
rename to e2e/snapshot-escape/__tests__/snapshotEscapeRegex.js
diff --git a/e2e/snapshot-escape/__tests__/snapshot_escape_substitution.test.js b/e2e/snapshot-escape/__tests__/snapshotEscapeSubstitution.test.js
similarity index 100%
rename from e2e/snapshot-escape/__tests__/snapshot_escape_substitution.test.js
rename to e2e/snapshot-escape/__tests__/snapshotEscapeSubstitution.test.js
diff --git a/e2e/snapshot-serializers/package.json b/e2e/snapshot-serializers/package.json
index 4e1ce54a0258..658160fc0f8e 100644
--- a/e2e/snapshot-serializers/package.json
+++ b/e2e/snapshot-serializers/package.json
@@ -2,7 +2,7 @@
   "jest": {
     "testEnvironment": "node",
     "transform": {
-      "^.+\\.js$": "<rootDir>/Transformer.js"
+      "^.+\\.js$": "<rootDir>/transformer.js"
     },
     "snapshotSerializers": [
       "./plugins/foo",
diff --git a/e2e/snapshot-serializers/plugins/bar.js b/e2e/snapshot-serializers/plugins/bar.js
index 6f70bfc05b43..a506f2858069 100644
--- a/e2e/snapshot-serializers/plugins/bar.js
+++ b/e2e/snapshot-serializers/plugins/bar.js
@@ -8,6 +8,6 @@
 
 /* eslint-disable no-unused-vars */
 
-const createPlugin = require('../Utils').createPlugin;
+const createPlugin = require('../utils').createPlugin;
 
 // We inject the call to "createPlugin('bar') through the transformer"
diff --git a/e2e/snapshot-serializers/plugins/foo/index.js b/e2e/snapshot-serializers/plugins/foo/index.js
index 51e32d9fac12..696d39a315c7 100644
--- a/e2e/snapshot-serializers/plugins/foo/index.js
+++ b/e2e/snapshot-serializers/plugins/foo/index.js
@@ -6,5 +6,5 @@
  *
  */
 
-const createPlugin = require('../../Utils').createPlugin;
+const createPlugin = require('../../utils').createPlugin;
 module.exports = createPlugin('foo');
diff --git a/e2e/snapshot-serializers/Transformer.js b/e2e/snapshot-serializers/transformer.js
similarity index 100%
rename from e2e/snapshot-serializers/Transformer.js
rename to e2e/snapshot-serializers/transformer.js
diff --git a/e2e/snapshot-serializers/Utils.js b/e2e/snapshot-serializers/utils.js
similarity index 100%
rename from e2e/snapshot-serializers/Utils.js
rename to e2e/snapshot-serializers/utils.js
diff --git a/e2e/snapshot/__tests__/second_snapshot.test.js b/e2e/snapshot/__tests__/secondSnapshot.test.js
similarity index 100%
rename from e2e/snapshot/__tests__/second_snapshot.test.js
rename to e2e/snapshot/__tests__/secondSnapshot.test.js
diff --git a/e2e/stack-trace-no-capture-stack-trace/__tests__/runtime_error.test.js b/e2e/stack-trace-no-capture-stack-trace/__tests__/runtimeError.test.js
similarity index 100%
rename from e2e/stack-trace-no-capture-stack-trace/__tests__/runtime_error.test.js
rename to e2e/stack-trace-no-capture-stack-trace/__tests__/runtimeError.test.js
diff --git a/e2e/stack-trace-source-maps/package.json b/e2e/stack-trace-source-maps/package.json
index 8941387eb502..5a20e78c8014 100644
--- a/e2e/stack-trace-source-maps/package.json
+++ b/e2e/stack-trace-source-maps/package.json
@@ -2,7 +2,7 @@
   "jest": {
     "rootDir": "./",
     "transform": {
-      "^.+\\.(ts)$": "<rootDir>/Preprocessor.js"
+      "^.+\\.(ts)$": "<rootDir>/preprocessor.js"
     },
     "testEnvironment": "node",
     "moduleFileExtensions": [
diff --git a/e2e/stack-trace-source-maps/Preprocessor.js b/e2e/stack-trace-source-maps/preprocessor.js
similarity index 100%
rename from e2e/stack-trace-source-maps/Preprocessor.js
rename to e2e/stack-trace-source-maps/preprocessor.js
diff --git a/e2e/stack-trace/__tests__/runtime_error.test.js b/e2e/stack-trace/__tests__/runtimeError.test.js
similarity index 100%
rename from e2e/stack-trace/__tests__/runtime_error.test.js
rename to e2e/stack-trace/__tests__/runtimeError.test.js
diff --git a/e2e/stack-trace/__tests__/stack_trace.test.js b/e2e/stack-trace/__tests__/stackTrace.test.js
similarity index 100%
rename from e2e/stack-trace/__tests__/stack_trace.test.js
rename to e2e/stack-trace/__tests__/stackTrace.test.js
diff --git a/e2e/stack-trace/__tests__/stack_trace_without_message.test.js b/e2e/stack-trace/__tests__/stackTraceWithoutMessage.test.js
similarity index 100%
rename from e2e/stack-trace/__tests__/stack_trace_without_message.test.js
rename to e2e/stack-trace/__tests__/stackTraceWithoutMessage.test.js
diff --git a/e2e/stack-trace/__tests__/test_error.test.js b/e2e/stack-trace/__tests__/testError.test.js
similarity index 100%
rename from e2e/stack-trace/__tests__/test_error.test.js
rename to e2e/stack-trace/__tests__/testError.test.js
diff --git a/e2e/testNamePattern_skipped/__tests__/test_name_pattern_skipped.test.js b/e2e/test-name-pattern-skipped/__tests__/testNamePatternSkipped.test.js
similarity index 100%
rename from e2e/testNamePattern_skipped/__tests__/test_name_pattern_skipped.test.js
rename to e2e/test-name-pattern-skipped/__tests__/testNamePatternSkipped.test.js
diff --git a/e2e/testNamePattern/package.json b/e2e/test-name-pattern-skipped/package.json
similarity index 100%
rename from e2e/testNamePattern/package.json
rename to e2e/test-name-pattern-skipped/package.json
diff --git a/e2e/testNamePattern/__tests__/test_name_pattern.test.js b/e2e/test-name-pattern/__tests__/testNamePattern.test.js
similarity index 100%
rename from e2e/testNamePattern/__tests__/test_name_pattern.test.js
rename to e2e/test-name-pattern/__tests__/testNamePattern.test.js
diff --git a/e2e/testNamePattern_skipped/package.json b/e2e/test-name-pattern/package.json
similarity index 100%
rename from e2e/testNamePattern_skipped/package.json
rename to e2e/test-name-pattern/package.json
diff --git a/e2e/testResultsProcessor/__tests__/processor.test.js b/e2e/test-results-processor/__tests__/processor.test.js
similarity index 100%
rename from e2e/testResultsProcessor/__tests__/processor.test.js
rename to e2e/test-results-processor/__tests__/processor.test.js
diff --git a/e2e/testResultsProcessor/package.json b/e2e/test-results-processor/package.json
similarity index 100%
rename from e2e/testResultsProcessor/package.json
rename to e2e/test-results-processor/package.json
diff --git a/e2e/testResultsProcessor/processor.js b/e2e/test-results-processor/processor.js
similarity index 100%
rename from e2e/testResultsProcessor/processor.js
rename to e2e/test-results-processor/processor.js
diff --git a/e2e/test-todo/__tests__/todo_multiple_args.test.js b/e2e/test-todo/__tests__/todoMultipleArgs.test.js
similarity index 100%
rename from e2e/test-todo/__tests__/todo_multiple_args.test.js
rename to e2e/test-todo/__tests__/todoMultipleArgs.test.js
diff --git a/e2e/test-todo/__tests__/todo_no_args.test.js b/e2e/test-todo/__tests__/todoNoArgs.test.js
similarity index 100%
rename from e2e/test-todo/__tests__/todo_no_args.test.js
rename to e2e/test-todo/__tests__/todoNoArgs.test.js
diff --git a/e2e/test-todo/__tests__/todo_non_string.test.js b/e2e/test-todo/__tests__/todoNonString.test.js
similarity index 100%
rename from e2e/test-todo/__tests__/todo_non_string.test.js
rename to e2e/test-todo/__tests__/todoNonString.test.js
diff --git a/e2e/timer-reset-mocks/after-reset-all-mocks/timer_and_mock.test.js b/e2e/timer-reset-mocks/after-reset-all-mocks/timerAndMock.test.js
similarity index 100%
rename from e2e/timer-reset-mocks/after-reset-all-mocks/timer_and_mock.test.js
rename to e2e/timer-reset-mocks/after-reset-all-mocks/timerAndMock.test.js
diff --git a/e2e/timer-reset-mocks/with-reset-mocks/timer_with_mock.test.js b/e2e/timer-reset-mocks/with-reset-mocks/timerWithMock.test.js
similarity index 100%
rename from e2e/timer-reset-mocks/with-reset-mocks/timer_with_mock.test.js
rename to e2e/timer-reset-mocks/with-reset-mocks/timerWithMock.test.js
diff --git a/e2e/timer-use-real-timers/__tests__/use_real_timers.test.js b/e2e/timer-use-real-timers/__tests__/useRealTimers.test.js
similarity index 100%
rename from e2e/timer-use-real-timers/__tests__/use_real_timers.test.js
rename to e2e/timer-use-real-timers/__tests__/useRealTimers.test.js
diff --git a/e2e/toMatchInlineSnapshot/babel.config.js b/e2e/to-match-inline-snapshot/babel.config.js
similarity index 100%
rename from e2e/toMatchInlineSnapshot/babel.config.js
rename to e2e/to-match-inline-snapshot/babel.config.js
diff --git a/e2e/toMatchInlineSnapshot/package.json b/e2e/to-match-inline-snapshot/package.json
similarity index 100%
rename from e2e/toMatchInlineSnapshot/package.json
rename to e2e/to-match-inline-snapshot/package.json
diff --git a/e2e/toMatchSnapshot/package.json b/e2e/to-match-snapshot/package.json
similarity index 100%
rename from e2e/toMatchSnapshot/package.json
rename to e2e/to-match-snapshot/package.json
diff --git a/e2e/toThrowErrorMatchingInlineSnapshot/babel.config.js b/e2e/to-throw-error-matching-inline-snapshot/babel.config.js
similarity index 100%
rename from e2e/toThrowErrorMatchingInlineSnapshot/babel.config.js
rename to e2e/to-throw-error-matching-inline-snapshot/babel.config.js
diff --git a/e2e/toThrowErrorMatchingInlineSnapshot/package.json b/e2e/to-throw-error-matching-inline-snapshot/package.json
similarity index 100%
rename from e2e/toThrowErrorMatchingInlineSnapshot/package.json
rename to e2e/to-throw-error-matching-inline-snapshot/package.json
diff --git a/e2e/toThrowErrorMatchingSnapshot/package.json b/e2e/to-throw-error-matching-snapshot/package.json
similarity index 100%
rename from e2e/toThrowErrorMatchingSnapshot/package.json
rename to e2e/to-throw-error-matching-snapshot/package.json
diff --git a/e2e/transform-linked-modules/__tests__/linked-modules.test.js b/e2e/transform-linked-modules/__tests__/linkedModules.test.js
similarity index 100%
rename from e2e/transform-linked-modules/__tests__/linked-modules.test.js
rename to e2e/transform-linked-modules/__tests__/linkedModules.test.js
diff --git a/e2e/transform-linked-modules/package.json b/e2e/transform-linked-modules/package.json
index 55214f57d3e8..0887a1756750 100644
--- a/e2e/transform-linked-modules/package.json
+++ b/e2e/transform-linked-modules/package.json
@@ -7,7 +7,7 @@
       "<rootDir>/ignored/"
     ],
     "transform": {
-      "^.+\\.js$": "<rootDir>/Preprocessor.js"
+      "^.+\\.js$": "<rootDir>/preprocessor.js"
     }
   }
 }
diff --git a/e2e/transform-linked-modules/Preprocessor.js b/e2e/transform-linked-modules/preprocessor.js
similarity index 100%
rename from e2e/transform-linked-modules/Preprocessor.js
rename to e2e/transform-linked-modules/preprocessor.js
diff --git a/e2e/transform/babel-jest/__tests__/babel_jest.test.js b/e2e/transform/babel-jest/__tests__/babelJest.test.js
similarity index 84%
rename from e2e/transform/babel-jest/__tests__/babel_jest.test.js
rename to e2e/transform/babel-jest/__tests__/babelJest.test.js
index 9dfb88ae75cd..f657e72cafae 100644
--- a/e2e/transform/babel-jest/__tests__/babel_jest.test.js
+++ b/e2e/transform/babel-jest/__tests__/babelJest.test.js
@@ -7,7 +7,7 @@
 
 'use strict';
 
-require('../this-directory-is-covered/ExcludedFromCoverage');
+require('../this-directory-is-covered/excludedFromCoverage');
 
 it('strips flowtypes using babel-jest and .babelrc', () => {
   const a: string = 'a';
diff --git a/e2e/transform/babel-jest/__tests__/changed_cwd.test.js b/e2e/transform/babel-jest/__tests__/changedCwd.test.js
similarity index 88%
rename from e2e/transform/babel-jest/__tests__/changed_cwd.test.js
rename to e2e/transform/babel-jest/__tests__/changedCwd.test.js
index 74b213a9593b..ae8f55d62896 100644
--- a/e2e/transform/babel-jest/__tests__/changed_cwd.test.js
+++ b/e2e/transform/babel-jest/__tests__/changedCwd.test.js
@@ -13,7 +13,7 @@ beforeAll(() => {
   process.chdir(path.resolve(__dirname, '../some-dir'));
 
   // even though we change the cwd, correct config is still found
-  require('../this-directory-is-covered/ExcludedFromCoverage');
+  require('../this-directory-is-covered/excludedFromCoverage');
 });
 
 it('strips flowtypes using babel-jest and .babelrc', () => {
diff --git a/e2e/transform/babel-jest/NotCovered.js b/e2e/transform/babel-jest/notCovered.js
similarity index 100%
rename from e2e/transform/babel-jest/NotCovered.js
rename to e2e/transform/babel-jest/notCovered.js
diff --git a/e2e/transform/babel-jest/package.json b/e2e/transform/babel-jest/package.json
index 1d2c6f501017..a070c4c33e01 100644
--- a/e2e/transform/babel-jest/package.json
+++ b/e2e/transform/babel-jest/package.json
@@ -4,11 +4,11 @@
   },
   "jest": {
     "collectCoverageOnlyFrom": {
-      "<rootDir>/this-directory-is-covered/Covered.js": true,
-      "<rootDir>/this-directory-is-covered/ExcludedFromCoverage.js": true
+      "<rootDir>/this-directory-is-covered/covered.js": true,
+      "<rootDir>/this-directory-is-covered/excludedFromCoverage.js": true
     },
     "coveragePathIgnorePatterns": [
-      "ExcludedFromCoverage"
+      "excludedFromCoverage"
     ],
     "testEnvironment": "node"
   }
diff --git a/e2e/transform/babel-jest/this-directory-is-covered/Covered.js b/e2e/transform/babel-jest/this-directory-is-covered/covered.js
similarity index 100%
rename from e2e/transform/babel-jest/this-directory-is-covered/Covered.js
rename to e2e/transform/babel-jest/this-directory-is-covered/covered.js
diff --git a/e2e/transform/babel-jest/this-directory-is-covered/ExcludedFromCoverage.js b/e2e/transform/babel-jest/this-directory-is-covered/excludedFromCoverage.js
similarity index 87%
rename from e2e/transform/babel-jest/this-directory-is-covered/ExcludedFromCoverage.js
rename to e2e/transform/babel-jest/this-directory-is-covered/excludedFromCoverage.js
index 12616bcb0a6e..42144c78d095 100644
--- a/e2e/transform/babel-jest/this-directory-is-covered/ExcludedFromCoverage.js
+++ b/e2e/transform/babel-jest/this-directory-is-covered/excludedFromCoverage.js
@@ -5,8 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-require('./Covered');
-require('../NotCovered');
+require('./covered');
+require('../notCovered');
 
 const thisFunctionIsNeverInstrumented = () => null;
 
diff --git a/e2e/transform/custom-instrumenting-preprocessor/__tests__/custom_preprocessor.test.js b/e2e/transform/custom-instrumenting-preprocessor/__tests__/customPreprocessor.test.js
similarity index 100%
rename from e2e/transform/custom-instrumenting-preprocessor/__tests__/custom_preprocessor.test.js
rename to e2e/transform/custom-instrumenting-preprocessor/__tests__/customPreprocessor.test.js
diff --git a/e2e/transform/custom-instrumenting-preprocessor/package.json b/e2e/transform/custom-instrumenting-preprocessor/package.json
index 7e4bce94a8ee..088eb25348a4 100644
--- a/e2e/transform/custom-instrumenting-preprocessor/package.json
+++ b/e2e/transform/custom-instrumenting-preprocessor/package.json
@@ -1,7 +1,7 @@
 {
   "jest": {
     "transform": {
-      "^.+\\.js$": "<rootDir>/Preprocessor.js"
+      "^.+\\.js$": "<rootDir>/preprocessor.js"
     },
     "testEnvironment": "node"
   }
diff --git a/e2e/transform/custom-instrumenting-preprocessor/Preprocessor.js b/e2e/transform/custom-instrumenting-preprocessor/preprocessor.js
similarity index 100%
rename from e2e/transform/custom-instrumenting-preprocessor/Preprocessor.js
rename to e2e/transform/custom-instrumenting-preprocessor/preprocessor.js
diff --git a/e2e/transform/ecmascript-modules-support/__tests__/ecmascript-modules-support.mjs b/e2e/transform/ecmascript-modules-support/__tests__/ecmascriptModulesSupport.mjs
similarity index 100%
rename from e2e/transform/ecmascript-modules-support/__tests__/ecmascript-modules-support.mjs
rename to e2e/transform/ecmascript-modules-support/__tests__/ecmascriptModulesSupport.mjs
diff --git a/e2e/transform/multiple-transformers/__tests__/__snapshots__/multiple_transformers.test.js.snap b/e2e/transform/multiple-transformers/__tests__/__snapshots__/multipleTransformers.test.js.snap
similarity index 100%
rename from e2e/transform/multiple-transformers/__tests__/__snapshots__/multiple_transformers.test.js.snap
rename to e2e/transform/multiple-transformers/__tests__/__snapshots__/multipleTransformers.test.js.snap
diff --git a/e2e/transform/multiple-transformers/__tests__/multiple_transformers.test.js b/e2e/transform/multiple-transformers/__tests__/multipleTransformers.test.js
similarity index 100%
rename from e2e/transform/multiple-transformers/__tests__/multiple_transformers.test.js
rename to e2e/transform/multiple-transformers/__tests__/multipleTransformers.test.js
diff --git a/e2e/transform/multiple-transformers/CssPreprocessor.js b/e2e/transform/multiple-transformers/cssPreprocessor.js
similarity index 100%
rename from e2e/transform/multiple-transformers/CssPreprocessor.js
rename to e2e/transform/multiple-transformers/cssPreprocessor.js
diff --git a/e2e/transform/multiple-transformers/FilePreprocessor.js b/e2e/transform/multiple-transformers/filePreprocessor.js
similarity index 100%
rename from e2e/transform/multiple-transformers/FilePreprocessor.js
rename to e2e/transform/multiple-transformers/filePreprocessor.js
diff --git a/e2e/transform/multiple-transformers/JsPreprocessor.js b/e2e/transform/multiple-transformers/jsPreprocessor.js
similarity index 100%
rename from e2e/transform/multiple-transformers/JsPreprocessor.js
rename to e2e/transform/multiple-transformers/jsPreprocessor.js
diff --git a/e2e/transform/multiple-transformers/package.json b/e2e/transform/multiple-transformers/package.json
index 56cd63ecd3d2..393763823ac8 100644
--- a/e2e/transform/multiple-transformers/package.json
+++ b/e2e/transform/multiple-transformers/package.json
@@ -1,9 +1,9 @@
 {
   "jest": {
     "transform": {
-      "^.+\\.css$": "<rootDir>/CssPreprocessor.js",
-      "^.+\\.js$": "<rootDir>/JsPreprocessor.js",
-      "^.+\\.svg$": "<rootDir>/FilePreprocessor.js"
+      "^.+\\.css$": "<rootDir>/cssPreprocessor.js",
+      "^.+\\.js$": "<rootDir>/jsPreprocessor.js",
+      "^.+\\.svg$": "<rootDir>/filePreprocessor.js"
     },
     "testEnvironment": "node"
   },
diff --git a/e2e/transform/no-babel-jest/__tests__/fails_with_syntax_error.test.js b/e2e/transform/no-babel-jest/__tests__/failsWithSyntaxError.test.js
similarity index 100%
rename from e2e/transform/no-babel-jest/__tests__/fails_with_syntax_error.test.js
rename to e2e/transform/no-babel-jest/__tests__/failsWithSyntaxError.test.js
diff --git a/e2e/transform/no-babel-jest/__tests__/passes-with-no-babel-jest.js b/e2e/transform/no-babel-jest/__tests__/passesWithNoBabelJest.js
similarity index 80%
rename from e2e/transform/no-babel-jest/__tests__/passes-with-no-babel-jest.js
rename to e2e/transform/no-babel-jest/__tests__/passesWithNoBabelJest.js
index 790c502f785f..5696e9979292 100644
--- a/e2e/transform/no-babel-jest/__tests__/passes-with-no-babel-jest.js
+++ b/e2e/transform/no-babel-jest/__tests__/passesWithNoBabelJest.js
@@ -7,6 +7,6 @@
 
 'use strict';
 
-require('../this-directory-is-covered/ExcludedFromCoverage');
+require('../this-directory-is-covered/excludedFromCoverage');
 
 test('1', () => {});
diff --git a/e2e/transform/no-babel-jest/package.json b/e2e/transform/no-babel-jest/package.json
index 9fb09b127a3b..16da6b6cf73c 100644
--- a/e2e/transform/no-babel-jest/package.json
+++ b/e2e/transform/no-babel-jest/package.json
@@ -1,11 +1,11 @@
 {
   "jest": {
     "collectCoverageOnlyFrom": {
-      "<rootDir>/this-directory-is-covered/Covered.js": true,
-      "<rootDir>/this-directory-is-covered/ExcludedFromCoverage.js": true
+      "<rootDir>/this-directory-is-covered/covered.js": true,
+      "<rootDir>/this-directory-is-covered/excludedFromCoverage.js": true
     },
     "coveragePathIgnorePatterns": [
-      "ExcludedFromCoverage"
+      "excludedFromCoverage"
     ],
     "testEnvironment": "node"
   }
diff --git a/e2e/transform/no-babel-jest/this-directory-is-covered/Covered.js b/e2e/transform/no-babel-jest/this-directory-is-covered/covered.js
similarity index 100%
rename from e2e/transform/no-babel-jest/this-directory-is-covered/Covered.js
rename to e2e/transform/no-babel-jest/this-directory-is-covered/covered.js
diff --git a/e2e/transform/no-babel-jest/this-directory-is-covered/ExcludedFromCoverage.js b/e2e/transform/no-babel-jest/this-directory-is-covered/excludedFromCoverage.js
similarity index 93%
rename from e2e/transform/no-babel-jest/this-directory-is-covered/ExcludedFromCoverage.js
rename to e2e/transform/no-babel-jest/this-directory-is-covered/excludedFromCoverage.js
index 5d5170a2909a..a79a9fa2dc0f 100644
--- a/e2e/transform/no-babel-jest/this-directory-is-covered/ExcludedFromCoverage.js
+++ b/e2e/transform/no-babel-jest/this-directory-is-covered/excludedFromCoverage.js
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-require('./Covered');
+require('./covered');
 
 const thisFunctionIsNeverInstrumented = () => null;
 
diff --git a/e2e/typescript-coverage/__tests__/covered-test.ts b/e2e/typescript-coverage/__tests__/coveredTest.ts
similarity index 100%
rename from e2e/typescript-coverage/__tests__/covered-test.ts
rename to e2e/typescript-coverage/__tests__/coveredTest.ts
diff --git a/e2e/typescript-coverage/package.json b/e2e/typescript-coverage/package.json
index 9b6cf144b886..667e970829c2 100644
--- a/e2e/typescript-coverage/package.json
+++ b/e2e/typescript-coverage/package.json
@@ -2,7 +2,7 @@
   "jest": {
     "rootDir": "./",
     "transform": {
-      "^.+\\.(ts|js)$": "<rootDir>/TypescriptPreprocessor.js"
+      "^.+\\.(ts|js)$": "<rootDir>/typescriptPreprocessor.js"
     },
     "testMatch": [
       "**/__tests__/*.+(ts|tsx|js)"
diff --git a/e2e/typescript-coverage/TypescriptPreprocessor.js b/e2e/typescript-coverage/typescriptPreprocessor.js
similarity index 100%
rename from e2e/typescript-coverage/TypescriptPreprocessor.js
rename to e2e/typescript-coverage/typescriptPreprocessor.js
diff --git a/karma.conf.js b/karma.conf.js
index 539a80e9d616..d0cde3e7c381 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -8,10 +8,10 @@
 module.exports = config => {
   config.set({
     browsers: ['ChromeHeadless'],
-    files: ['e2e/browser-support/browser-test.js'],
+    files: ['e2e/browser-support/browserTest.js'],
     frameworks: ['mocha', 'browserify'],
     preprocessors: {
-      'e2e/browser-support/browser-test.js': ['browserify'],
+      'e2e/browser-support/browserTest.js': ['browserify'],
     },
   });
 };