Simulates the asynchronous passage of time for the timers in the fakeAsync zone.

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Description

The microtasks queue is drained at the very start of this function and after any timer callback has been executed.

Usage notes

Example

describe('this test', () => {
  it('looks async but is synchronous', <any>fakeAsync((): void => {
       let flag = false;
       setTimeout(() => { flag = true; }, 100);
       expect(flag).toBe(false);
       tick(50);
       expect(flag).toBe(false);
       tick(50);
       expect(flag).toBe(true);
     }));
});