How to return different values from a mock service for two different tests?

Question

How do I return two different values from this mock service when I am providing it in the initial test for the component? I want to be able to return two different values for two different tests from mock service

describe('example', () => { let component: ExampleComponent; let fixture: ComponentFixture<ExampleComponent>; let mockService: Partial<MockService>; beforeEach(async(() => { mockService = { mockMethodSpy: jasmine.createSpy('mockMethod') }; TestBed.configureTestingModule({ declarations: [ ExampleComponent], imports: [], providers: [ { provide: MockService, useValue: mockService }, ] }) .compileComponents(); })); beforeEach(() => { fixture = TestBed.createComponent(ExampleComponent); component = fixture.componentInstance; fixture.detectChanges(); }); it('should return true from mock service', () => { expect(mockService.mockMethodSpy).toBe(true); }); it('should return false from mock service', () => { expect(mockService.mockMethodSpy).toBe(false); }); });

Why are you asserting/testing what your spy returns, instead of testing the subject component? — Frank Fajardo
– Frank Fajardo, Commented Dec 29, 2020 at 1:18
Does this answer your question? stackoverflow.com/a/16208124/2358409 — uminder
– uminder, Commented Dec 29, 2020 at 7:27

satanTime · Accepted Answer · 2020-12-30 07:17:56Z

1

spy can be configured on the fly. just call the configuring methods, and it will behave differentrly

it('should 1', () => { mockService.mockMethodSpy.and.returnValue(12345); expect(mockService.mockMethodSpy()).toBe(12345); }); it('should 2', () => { mockService.mockMethodSpy.and.callFake(() => 54321); expect(mockService.mockMethodSpy()).toBe(54321); });

edited Dec 30, 2020 at 7:17

satanTime

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answered Dec 29, 2020 at 1:50

Andrei

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2 Comments

satanTime Over a year ago

@milanf, what is wrong with this answer? Looks like what you asked.

lostintranslation Jun 17 at 16:37

Doesn't work for me, in OP question the type of let mockService: Partial<MockService> is messing things up in the test as its not a jasmine spy object. Would help if you provided a full example that compiles.

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