Wraps a function to be executed in the fakeAsync zone:

• Microtasks are manually executed by calling flushMicrotasks().
• Timers are synchronous; tick() simulates the asynchronous passage of time.

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Description

If there are any pending timers at the end of the function, an exception is thrown.

Can be used to wrap inject() calls.

Further information is 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);
     }));
});