manualCD.ts

it('checks state while async action is in progress', async () => {
  const buttonHarness = loader.getHarness(MyButtonHarness);
  await manualChangeDetection(async () => {
    await buttonHarness.click();
    fixture.detectChanges();
    // Check expectations while async click operation is in progress.
    expect(isProgressSpinnerVisible()).toBe(true);
    await fixture.whenStable();
    // Check expectations after async click operation complete.
    expect(isProgressSpinnerVisible()).toBe(false);
  });
});