rename *.test.js to *-test.js to match naming convention

Summary:
bypass-lint

from the task:
```
Right now any file inside __tests__ on www is considered a test. This makes it difficult to create test helpers that make the code cleaner, as they're interpreted as tests and thus executed.

We should restrict tests to files ending with -test.js (as it's the general convention there).
```

Reviewed By: scotthovestadt

Differential Revision: D14856710

fbshipit-source-id: 900735c423b04472d46ab10158779a20bbcc2506

Author: boujeepossum