Add a config for Coveralls

[wonderboymusic]

We should try to use Coveralls for Test Coverage:
​https://coveralls.io/

[johnbillion]

We should try some actual CI. Can we get this set up on the WordPress/WordPress repo on GitHub instead of having to rely on Aaron's fork?

Also, the WP REST API recently switched from Coveralls to Codecov, but I don't think it was for any reason other than needing to use a branch other than master as the default branch.

[pento]

@nacin is going to be looking at fixing the WordPress/WordPress repo on GitHub soon, so we can use GH integrations from there instead.

[netweb]

Replying to johnbillion:

We should try some actual CI. Can we get this set up on the WordPress/WordPress repo on GitHub instead of having to rely on Aaron's fork?

Code Climate is using that repo ​https://codeclimate.com/github/WordPress/WordPress, but they do things a little different, anyone can add a "public" repo e.g. ​https://codeclimate.com/github/WP-API/WP-API and the results are public.

Nacin's going to fix this, because he said "gonna" ;) ​https://twitter.com/nacin/status/635314769550028800

Also, the WP REST API recently switched from Coveralls to Codecov, but I don't think it was for any reason other than needing to use a branch other than master as the default branch.

I believe this was primarily because Coveralls could not use a default branch other than master which was a problem for pull requests.

Either way, at the moment we're going to add Code Climate and Coveralls for starters to evaluate which is best for our use case, I've already done Codecov previously which we can also look at by the way ​https://codecov.io/github/ntwb/wordpress

[rmccue]

Now that we've used it on the API for a bit, Codecov is actually a bit better of a tool. Coveralls often has problems with percentages not staying constant with the same set of code, Codecov seems to do a better job.

[jorbin]

Codecov - ​https://codecov.io/github/aaronjorbin/wordpress.codecov
Coveralls - ​https://coveralls.io/github/aaronjorbin/wordpress.codecov

Both of these are run once an hour if there have been commits in the last hour. If we move more infrastructure over to github, we can revisit how these are generated, but I'm going to close this for 4.4 as done in the meantime.

The sync script and alternative .travis.yml are located at: ​https://github.com/aaronjorbin/develop-sync

For some explanation on why there is a separate repo with a separate .travis.yml, see ​https://daily.jorb.in/2015/10/23/automated-code-coverage-of-wordpress-core-php-code/ (essentially it comes down to time)