ChangeDetectorRef cannot be injected on test bed! You’ll need to directly spy on them.

it('should call markForCheck when do a barrel roll.', () => {
	const changeDetectorRef = fixture.debugElement.injector.get(ChangeDetectorRef);
	const detectChangesSpy = spyOn(changeDetectorRef.constructor.prototype, 'markForCheck');

	doABarrelRoll();

	expect(detectChangesSpy).toHaveBeenCalled();
});

References:

• https://stackoverflow.com/a/44269677/4721245