问题描述
我使用 spectator 对 Angular 组件进行了测试。尝试使用 spectatorRouting
找到模拟服务的解决方案。我有如下简单的服务:
export class ProductService {
constructor(private http: HttpClient) {}
getProduct(productId: string): Observable<Product>;
}
我有如下组件:
export class ProductComponent {
product$: Observable<boolean | Product>;
readonly routes = routes;
constructor(
private route: ActivatedRoute,private productService: ProductService,private router: Router
) {
this.product$ = this.route.paramMap.pipe(
map((params) => params.get('id')),switchMap((val) => productService.getProduct(val)),catchError(() => this.router.navigate([routes.notFoundPage]))
);
}
}
而且我找不到通过模拟 ProductService 方法返回值的漂亮解决方案。我实施了一个解决方案,但这很难看:(.
const productService = {
getProduct: () => of({}),};
describe('ProductComponentspectator',() => {
let spectator: spectatorRouting<ProductComponent>;
const createComponent = createRoutingFactory({
component: ProductComponent,params: { id: '100' },declarations: [
MainProductComponent,DetailsProductComponent,SpanTooltipComponent,],imports: [HttpClientTestingModule,RouterTestingModule],providers: [mockProvider(ProductService,productService)],});
beforeEach(() => {
spyOn(productService,'getProduct').and.returnValue(of(getProduct()));
spectator = createComponent();
});
it('should get brand name',() => {
expect(spectator.query('.product-brand')).toHaveExactText('Asus');
});
});
function getProduct(): Product {
return {
productId: '100',brand: 'Asus',} as Product;
}
我对这个解决方案有疑问,对我来说,在测试之上创建 const 服务和下一个 spyOn 相同的方法是一种奇怪的方法。我的直觉告诉我,这个模拟应该在提供者中完全定义(使用方法等)。 spectator 可能为 spectatorRouting 提供了更友好的 mocking 服务,但我没有找到。
感谢您的帮助。
解决方法
如果你想模拟它 - 你可以另外安装 ng-mocks 包,那么你就不需要 spyOn
和 getProduct
。
describe('ProductComponentSpectator',() => {
let spectator: SpectatorRouting<ProductComponent>;
const createComponent = createRoutingFactory({
component: ProductComponent,params: { id: '100' },declarations: [
MainProductComponent,DetailsProductComponent,SpanTooltipComponent,],imports: [HttpClientTestingModule,RouterTestingModule],providers: [
// MockProvider from ng-mocks (capital M)
MockProvider(ProductService,{
getProduct: () => of({
productId: '100',brand: 'Asus',} as Product),}),});
beforeEach(() => {
spectator = createComponent();
});
it('should get brand name',() => {
expect(spectator.query('.product-brand')).toHaveExactText('Asus');
});
});