茉莉花服务函数不返回模拟值

Question

我是第一次进行 angular 测试，从早上开始我就在努力测试它。我在 TestBed 中添加了两个模块并进行了注入，但始终调用真正的方法而不是从 getMockFeatureState() 返回值。请帮忙解决这个问题。谢谢

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [ HttpClientModule ],
      providers: [ FeatureToggleService, ConfigService]
    });
  });

  it('should return values based on mock feature state', () => {
    const featureService = TestBed.inject(FeatureToggleService);
    const configService = TestBed.inject(ConfigService);
    const mockFeaturesSpy = spyOn(configService, 'getMockFeatures')
        .and.returnValue(getMockFeatureState());
    expect(featureService.isFeatureEnabled('feature1')).toBeFalsy();
    expect(featureService.isFeatureEnabled('feature2')).toBeFalsy();
  });

Answer 1

我最近在我的一项测试中遇到了同样的问题。 TestBed.inject 的顺序是问题所在。如果 FeatureToggleService 需要 ConfigService。您必须先注入 ConfigService 并在注入 featureService 之前模拟它。你可以试试

  it('should return values based on mock feature state', () => {
    const configService = TestBed.inject(ConfigService);
    const mockFeaturesSpy = spyOn(configService, 'getMockFeatures')
        .and.returnValue(getMockFeatureState());
    const featureService = TestBed.inject(FeatureToggleService);
    expect(featureService.isFeatureEnabled('feature1')).toBeFalsy();
    expect(featureService.isFeatureEnabled('feature2')).toBeFalsy();
  });

Answer 2

我也像其他答案中提到的那样将依赖服务的注入移动到 beforeEach 块中，以便它也可以应用于其他测试

茉莉花服务函数不返回模拟值

jasmine serivce function not returning mock value

unit-testing

jasmine

karma-jasmine