Question

TypeError：service.getValue不是函数

public Set<Mobile> search(Set<Mobile> mobiles, OperatingSystem os,
        Brand brand,Display display, Style style) {
    Set<Mobile> result = new HashSet<>();
    for (Set<Mobile> mobile: mobiles) {
        if ((os == null || os.equals(mobile.getOs()))
                && (brand == null || brand.equals(mobile.getBrand()))
                && (display == null || display.equals(mobile.getDisplay()))
                && (style == null || style.equals(mobile.getStyle()))) {
            result.add(mobile);
        }
    }
    return result;
}

单元测试：

let data: string;

@Injectable()
export class MyService {
constructor() {
    myOtherObservableReturning.subscribe((data: mydata) => {
           data.items.forEach((item: Object)  => {
               .....
           }
        ...
        ...
    });
}
   public getValue() { return 'HelloWorld'; }
}

我无法弄清楚为什么单元测试无法找到函数let service: MyService; beforeEach(() => { TestBed.configureTestingModule({ providers: [ { provide: MyService, useValue: { data: Observable.of(dataStub) } } ] }); service = TestBed.get(MyService); }); it('should be created', () => { expect(service).toBeTruthy(); console.log(JSON.stringify(service)); //LOG: '{"params":{"_isScalar":true,"scheduler":null}}' }); it('should call getValue', () => { //TypeError: service.getValue is not a function expect(service.getValue()).toBe('HelloWorld'); });，我已经在服务文件中导入并检查了它。

Answer 1

确保您提供了service: MyService的类型。如果未指定type，则Typescript仅假定变量为any类型。

beforeEach(() => {
    TestBed.configureTestingModule({
        providers: [
            { provide: MyService, useValue: { data: Observable.of(dataStub) } }
        ]
    });
    service: MyService = TestBed.get(MyService);
});

Answer 2

问题已解决：我需要将data.items初始化为空数组。这是未定义的，这就是错误Cannot read property 'forEach' of undefined弹出的原因。

TypeError：service.getValue不是Angular2 Unit-Testing a Service中的函数

2 个答案: