.l-main-section h2(class="function export") tick pre.prettyprint code. tick(millis?: number) : void p.location-badge. exported from angular2/test defined in angular2/src/test_lib/fake_async.ts (line 73) :markdown Simulates the asynchronous passage of time for the timers in the fakeAsync zone. The microtasks queue is drained at the very start of this function and after any timer callback has been executed.