Add initial testing framework and example tests

.gitignore

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+/node_modules/

README.md

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-The new schematrons are here.
+# jats-schematrons
+
+The `schematrons` folder contains Schematron files that implement recommendations developed by the JATS4R group.
+
+
+## Testing
+
+`npm t` will run the tests in the `__tests__` folder against the XML files in the `testfiles` folder.

__tests__/contributors.test.js

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+const validate = require('../lib/validate')
+
+describe('authors and affiliations', () => {
+  test('aff label', async () => {
+    const results = await validate('auths-affs-test1.xml')
+
+    expect(results.errors).toHaveLength(2)
+    expect(results.warnings).toHaveLength(1)
+  })
+
+  test('author affiliation xref', async () => {
+    const results = await validate('auths-affs-test2.xml')
+
+    expect(results.errors).toHaveLength(1)
+  })
+})

lib/validate.js

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+const { readFileSync } = require('fs')
+const { parseXmlString } = require('libxmljs')
+const { validate } = require('schematron-runner')
+
+module.exports = name => {
+  const xml = readFileSync(`${__dirname}/../testfiles/${name}`, 'utf8')
+
+  const doc = parseXmlString(xml)
+
+  if (doc.errors.length) {
+    throw new Error(doc.errors.map(error => `ERROR: ${error.message}`).join('\n'))
+  }
+
+  return validate(doc.toString(), `${__dirname}/../schematrons/1.0/jats4r.sch`)
+}