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具有依赖关系的Service源代码：

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

单元测试代码：

describe('MasterService with Angular jasmine.createSpyObj', () => {
       let masterService: MasterService;    let valueServiceSpy: jasmine.SpyObj
   
    ;    beforeEach(() => {
           const spy = jasmine.createSpyObj('ValueService', ['getValue']);        TestBed.configureTestingModule({
       // Provide both the service-to-test and its (spy) dependency        providers: [ MasterService, {
    provide: ValueService, useValue: spy }]    });    // Inject both the service-to-test and its (spy) dependency        masterService = TestBed.inject(MasterService);        valueServiceSpy = TestBed.inject(ValueService) as jasmine.SpyObj
    
     ;    });    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);      });});
    
   

测试结果：

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