Bug 967216 - Intermittent calendar/test/unit/app_test.js | app global events moztimechange | expected 2 to equal 1

also note that this `setTimeout` is only executed **after** the test already passed, the `clock.tick(3100); assert.equal(calledWith, 1);` is executed **before** the `setTimeout` callback, so this test doesn't really prove the code is working as expected.