具有依賴關(guān)系的Service源代碼：

import { Injectable } from '@angular/core';@Injectable() export class MasterService {constructor(private valueService: ValueService) { }getValue() { return this.valueService.getValue(); } }export class ValueService {getValue() { return 'Jerry'; } }

單元測(cè)試代碼：

describe('MasterService with Angular jasmine.createSpyObj', () => {let masterService: MasterService;let valueServiceSpy: jasmine.SpyObj<ValueService>;beforeEach(() => {const spy = jasmine.createSpyObj('ValueService', ['getValue']);TestBed.configureTestingModule({// Provide both the service-to-test and its (spy) dependencyproviders: [ MasterService, { provide: ValueService, useValue: spy }]});// Inject both the service-to-test and its (spy) dependencymasterService = TestBed.inject(MasterService);valueServiceSpy = TestBed.inject(ValueService) as jasmine.SpyObj<ValueService>;});it('#getValue should return stubbed value from a spy', () => {const stubValue = 'stub value';valueServiceSpy.getValue.and.returnValue(stubValue);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);}); });

測(cè)試結(jié)果：

總結(jié)

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