elixir-lang/elixir-lang.github.com — pull request #150 by KeeperPat (2013-08-23 14:23:39+00:00)
Title: teardown must return :ok or {:ok, keywords}

Otherwise, the test will fail with a runtime error:

```
1) test the truth (CallbacksTest)
** (RuntimeError) expected ExUnit callback in CallbacksTest to
return :ok or { :ok, keywords }, got true instead
```