Devise tests are order dependent.

Until 4.2.0, any test suite based on the `TestCase` classes provided by Rails would
always run into alphabetical, but now they run in random order. For now, we ensure
that our tests always run in alphabetical order.

Related commit on rails/rails
https://github.com/rails/rails/commit/6ffb29d24e05abbd9ffe3ea974140d6c70221807