The test directory has a bug.js and a workaround.js.
If you run: npm install and then npm t you'll get:
~/Developer/ava-beforeEach-afterEach-bug (master)
⛄ $ npm run test -s
✔ workaround › first log
✔ workaround › second log
✔ bug › first log
✖ bug › second log
t.true(console.log.calledOnce)
|
false
1 test failed
1. second log
AssertionError: false === true
Test.fn (test/bug.js:16:3)
For some reason, it appears that perhaps the cleanup function is not run between the two test runs.