如何使用 jest 的参数测试请求 http - 角度答案

【问题标题】：How test request http with parameters with jest - angular如何使用 jest 的参数测试请求 http - 角度
【发布时间】：2020-05-15 06:12:28
【问题描述】：

我正在使用 Jest 测试 Angular 服务。

我可以模拟我的 httpClient，但我有一个问题是我无法使用参数测试 url（例如：“http://localhost:8080/api/feature/num?id=25663”）。

这是我的测试代码：

describe('MyService', () => {
   let myService: MyService;
   const httpMock = {get: jest.fn(() => of(dataMock))};
   const provide = (mock: any): any => mock;

   beforeEach(() => {
      myService= new MyService(provide(httpMock));
   });

   test('should created', () => {
     expect(myService).toBeTruthy();
   });

   test('should retrieve one user', (done) => {
     const number = 26586;
     const url = 'http://localhost:8080/api/feature/num?number=25663';

     myService.getNumero(number).subscribe( 
       res => {
          expect(httpMock.get).toBeCalledWith(url);
          expect(res.number).toBe(number);
          expect(res.city).toEqual('PARIS');
          done();
     });
   });
});

在我的控制台中我有这个错误：

Error: Uncaught [Error: expect(jest.fn()).toBeCalledWith(...expected)

Expected: "http://localhost:8080/api/feature/num?number=25663"
Received: "http://localhost:8080/api/feature/num, {
 "params": {
    "cloneFrom": {
        "cloneFrom": null, 
        "encoder": {}, 
        "map": null, 
        "updates": null
     },
     "encoder": {}, 
     "map": null,
     "updates": [{"op": "a", "param": "number", "value": "25663"}]
   }
 }

【问题讨论】：

标签： javascript angular unit-testing jestjs angular-test

【解决方案1】：

通常我喜欢这样

import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';

...

describe('MyService', () => {
    let injector: TestBed;
    let httpMock: HttpTestingController;

    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [HttpClientTestingModule],
            providers: [],
        });
        injector = getTestBed();
        httpMock = injector.get(HttpTestingController);
    });

    afterEach(() => {
        httpMock.verify();
    });

...

    it('should return number and city', () => {
        const expectedResult: {
            number: 26586,
            city: 'PARIS'
        };

        const service : MyService = TestBed.get(MyService);
        service.getNumero(number)
            .pipe(
                first(),
            )
            .subscribe((data) => {
                expect(data).toMatchObject(expectedResult);
            });

        const req = httpMock.expectOne(`http://localhost:8080/api/feature/num?number=25663`);
        expect(req.request.method).toBe('GET');
        req.flush(expectedResult);
    });

【讨论】：