我正在为Angular组件方法之一编写单元测试,该方法为服务调用的响应值分配一个属性并调用另一个方法。
我在服务中添加了响应数据,并在测试中使用预订内的Expect语句预订了该服务,但该服务始终将属性值显示为空数组。我已经确认以下测试中的“响应”包含模拟数据,但无法获取组件属性“ resultSet”以显示为已分配值。 “ toggleSearchForm()”方法的间谍似乎也从未被称为。
正在测试的方法: search.component.ts
submitSearchCriteria() {
this.searchService.searchRequest(this.myForm.value)
.pipe(take(1))
.subscribe(response => {
this.resultSet = response;
this.toggleSearchForm();
});
}
失败的测试: search.component.spec.ts
it('should assign resultSet to response data and trigger toggle', fakeAsync(() => {
const spy = spyOn(component, 'toggleSearchForm');
component.myForm.controls['field1'].setValue('some search query');
component.myForm.controls['field2'].setValue('something that narrows it down more');
searchServiceStub.searchRequest(component.myForm.value)
.subscribe(response => {
expect(component.resultSet).toContain(response);
expect(spy).toHaveBeenCalled();
expect(spy.calls.count()).toBe(1);
});
tick();
}))
服务存根: search-service.stub.ts
...
const searchResults = require('./test-data/search-results.json');
searchRequest(searchCriteria) {
if (!searchCriteria) {
return of([])
}
return of(searchResults);
}
我希望resultSet包含存根响应和间谍,但测试失败并显示以下错误消息:
Expected [ ] to contain [ Object({ thingName: 'thing i was searching for', thingId: 1234 }) ].
和
Error: Expected spy toggleSearchForm to have been called.
答案 0 :(得分:1)
我认为,如果您像这样测试组件方法,则组件测试将更有意义。
it('should assign resultSet to response data and trigger toggle', () => {
const spy = spyOn(component, 'toggleSearchForm');
const searchService = TestBed.get(SearchService) as SearchService;
const serviceSpy = spyOn(searchService, 'searchRequest').and.callThrough();
component.myForm.controls['field1'].setValue('some search query');
component.myForm.controls['field2'].setValue('something that narrows it down more');
component.submitSearchCriteria();
expect(component.resultSet).toEqual([{ thingName: 'thing i was searching for', thingId: 1234 }]);
expect(serviceSpy).toHaveBeenCalledWith(component.myForm.value);
expect(spy.calls.count()).toBe(1);
});
要使其正常工作,您的配置应类似于
TestBed.configureTestingModule({
declarations: [SearchComponent],
providers: [{provide: SearchService, useClass: SearchServiceStub}],
imports: [ReactiveFormsModule],
})
要注意的重要更改:
search-results.json
的搜索结果,因为这是您的搜索服务返回的结果component.submitSearchCriteria
(而不是您的存根服务)中呼叫