Angular2服务测试:注入依赖性的依赖性

Question

我正在使用Http依赖项测试服务。每个测试看起来都这样：

import { TestBed, async, inject } from '@angular/core/testing';
import { ValidationService } from './validation.service';
import { HttpModule, Http, Response, ResponseOptions, RequestOptions, Headers, XHRBackend } from '@angular/http';
import { MockBackend, MockConnection } from '@angular/http/testing';
describe('DashboardService', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpModule],
      providers: [
        ValidationService,
        { provide: XHRBackend, useClass: MockBackend }
      ]
    });
  });
  it('should ...',
    inject([ValidationService, XHRBackend],
      (service: ValidationService, mockBackEnd: MockBackend) => {
        mockBackEnd.connections.subscribe((connection: MockConnection) => {
          connection.mockRespond(new Response(new ResponseOptions({
            body: JSON.stringify('content')
          })));
        });
      }));
      // assertions ...
});

如您所见，我需要在每一个中注入后端模拟。

是否可以在每次测试之前使用beforeEach注入依赖关系？

Answer 1

是否可以在每次测试之前使用之前的each注入依赖关系？

确保您可以。

let service;
beforeEach(inject([Service], (svc) => {
  service = svc;
}))

尽管您也可以从TestBed获得服务，这也是喷油器

let service;
beforeEach(() => {
  TestBed.configureTestingModule({
    ...
  })
  service = TestBed.get(Service);
})