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tick

npm Package @angular/core
Module import { tick } from '@angular/core/testing';
Source core/testing/src/fake_async.ts 
      
      function tick(millis: number = 0): void;

Description

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.

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);
     }));
});