带参数的 angular http 服务调用单元测试

Question

我正在尝试测试此服务呼叫

get(): Observable<Country[]> { const config = { params: new HttpParams().set('pagesize', '300') }; return this.http .get<any>(`${api_url}countries`, config) .pipe(map(response => (response.data as Country[]))); }

这是测试：

describe('CountriesService Tests', () => {

let countriesService: CountriesService;
let httpTestingController: HttpTestingController;

let countries: Country[] = [
    { Country: 'ALBANIA', CountryCode: 'AL', ReportingCountryCode: 'ALB' },
    { Country: 'Canada', CountryCode: 'CA', ReportingCountryCode: 'CND' }];
beforeEach(() => {

    TestBed.configureTestingModule({
        imports: [HttpClientTestingModule],
        providers: [CountriesService]
    });
    countriesService = TestBed.get(CountriesService);
    httpTestingController = TestBed.get(HttpTestingController);
});
afterEach(() => {
    httpTestingController.verify();
});

it('should return all countries', () => {
    countriesService.get().subscribe((data: Country[]) => {
        expect(data).toBe(countries);
    });
    const url = ({ const: environment.url + 'countries', params: {'pagesize': '300'}});

    let countriesRequest: TestRequest = httpTestingController.expectOne(url.const + url.params);

    expect(countriesRequest.request.method).toEqual('GET');

    countriesRequest.flush(countries);
})});

我收到此错误：错误：预期有一个对条件“匹配 URL：/api/publicdata/countries[object Object]”的匹配请求，未找到。 关于传递给调用的参数的问题，我不知道如何添加它们。 你能帮忙吗？

Answer 1

不确定 OP 是否修复了它！

expectOne(url.const + url.params) // Wrong
expectOne(url.const + '?param1=value') // should be that

Answer 2

可能您在等待 http 调用后，请尝试以下测试用例

    it('should return all countries', () => {

    const url = ({ const: environment.url + 'countries', params: {'pagesize': '300'}});

    let countriesRequest: TestRequest = httpTestingController.expectOne(url.const + url.params);

    countriesService.getCountries().subscribe((data: Country[]) => {
            expect(data).toBe(countries);
        });

    expect(countriesRequest.request.method).toEqual('GET');

    countriesRequest.flush(countries);
})});

Answer 3

可能是我迟到了，但下面的解决方案对你们有用

1. 创建一个HttpParams对象append()所有查询参数添加到其中。
2. 创建HttpRequest对象并为其提供适当的值。
3. 然后调用httpTestingController.expectOne()如下所示
4. 我使用urlWithParams来比较 url，因为它减少了检查每个 param 对象的代码。

 it('should return all countries', fakeAsync(() => {

    countriesService.getCountries().subscribe((data: Country[]) => {
            expect(data).toBe(countries);
        });
     // you can create multiple parameters by appending on same object 
    let parameters = new HttpParams().append('pagesize', '30');
     
    // environment is your base url
    const httpReq = new HttpRequest('GET',environment.url, {params:parameters}); 

    let countriesRequest = httpTestingController.expectOne((req:HttpRequest)=>
        req.method === httpReq.method && req.urlWithParams === httpReq.urlWithParams
    );
   
    countriesRequest.flush(countries);
    httpTestingController.verify();
});