[This test is failing on TravisCI](https://travis-ci.org/mozilla-b2g/gaia/builds/10729382) because the TravisCI machine's time zone is different than your machine's. You'll want to normalize `this.start` in this suite's `setup` in a manner similar to [this simply inspired piece of test logic](https://github.com/mozilla-b2g/gaia/blob/74e710361f5023b2bb7045f15c39e6b9ad08792d/apps/clock/test/unit/clock_view_test.js#L21-L23)