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.

Further information available in the Usage Notes...

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);
     }));
});