fakeschedulers-ng-spec-patch.ts

it('should indicate when searching', fakeSchedulers(() => {
  const fixture = TestBed.createComponent(SomeComponent);
  fixture.detectChanges();
  const compiled = fixture.debugElement.nativeElement;
  const input = compiled.querySelector('input');
  expect(compiled.querySelector('.searching')).toBeNull();
  fixture.componentInstance.form.patchValue({ term: 'foo' });
  fixture.detectChanges();
  expect(compiled.querySelector('.searching')).toBeNull();
  tick(400);
  fixture.detectChanges();
  expect(compiled.querySelector('.searching')).not.toBeNull();
  expect(compiled.querySelector('.searching span').textContent).toMatch(/foo/);
}));