Summary: There are quite a few tests in Arcanist, libphutil and Phabricator that do something similar to `$this->assertEqual(false, ...)` or `$this->assertEqual(true, ...)`. This is unnecessarily verbose and it would be cleaner if we had `assertFalse` and `assertTrue` methods. Test Plan: I contemplated adding a unit test for the `getCallerInfo` method but wasn't sure if it was required / where it should live. Reviewers: epriestley, #blessed_reviewers Reviewed By: epriestley CC: Korvin, epriestley, aran Differential Revision: https://secure.phabricator.com/D8460