describe('MasterService without Angular testing support', () => { let masterService: MasterService; it('#getValue should return real value from the real service', () => { masterService = new MasterService(new ValueService()); expect(masterService.getValue()).toBe('real value'); }); it('#getValue should return faked value from a fakeService', () => { masterService = new MasterService(new FakeValueService()); expect(masterService.getValue()).toBe('faked service value'); }); it('#getValue should return faked value from a fake object', () => { const fake = { getValue: () => 'fake value' }; masterService = new MasterService(fake as ValueService); expect(masterService.getValue()).toBe('fake value'); }); it('#getValue should return stubbed value from a spy', () => { // create `getValue` spy on an object representing the ValueService const valueServiceSpy = jasmine.createSpyObj('ValueService', ['getValue']); // set the value to return when the `getValue` spy is called. const stubValue = 'stub value'; valueServiceSpy.getValue.and.returnValue(stubValue); masterService = new MasterService(valueServiceSpy); expect(masterService.getValue()) .toBe(stubValue, 'service returned stub value'); expect(valueServiceSpy.getValue.calls.count()) .toBe(1, 'spy method was called once'); expect(valueServiceSpy.getValue.calls.mostRecent().returnValue) .toBe(stubValue); }); });