Fix non-deterministic test ordering

The tests were failing prior to this because they depended specifically
on the date being returned correctly. Because we were using the same
hostname for all tests we would only randomly get the correct data for
the test we're looking at.

Lessons learned:

- Go executes tests in parallel by default
- Mongo doesn't provide us with any tools to help here
- setUp and tearDown functionality that was executed in a guaranteed
  order would have helped