Angular HttpClient Karma/Jasmine测试没有供应商

使用此simples.spec.ts文件：

会话服务：

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { Session } from '../models/Session';

@Injectable()
export class SessionService {

  sessionsURL = "http://localhost:8080/express/ux/sessions";
  constructor(private http: HttpClient) { }

  getSessions(user: string, pageTitle: string, deviceType: string, browser: string, beginDate: number, endDate: number, os: string, screenRes: string,company:string): Observable<Session[]> {
    return this.http.get<Session[]>(this.sessionsURL + this.buildArguments(user, pageTitle, deviceType, browser, beginDate, endDate, os, screenRes,company));
  }

它给了我那个错误。问题是，如果我将HTTPClientModule添加到规范导入中，它会正确加载，但会发出服务中的实际请求。它只是绕过了mock-getSessions方法

有什么线索吗，为什么会这样

---

我在另一个组件中采用了类似的方法，它很快就成功了。

对于使用HttpClientModule进行测试，Angular中有一个特殊的模块：HttpClientTestingModule。这允许您在HttpClientModule中模拟此操作，而无需执行真正的Http调用。您必须将此模块导入测试。希望能有帮助。

就是这样。解决了的！

  constructor(private es: NgxEchartsService, private sessionService: SessionService, private sorting: SortingService) { }

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { Session } from '../models/Session';

@Injectable()
export class SessionService {

  sessionsURL = "http://localhost:8080/express/ux/sessions";
  constructor(private http: HttpClient) { }

  getSessions(user: string, pageTitle: string, deviceType: string, browser: string, beginDate: number, endDate: number, os: string, screenRes: string,company:string): Observable<Session[]> {
    return this.http.get<Session[]>(this.sessionsURL + this.buildArguments(user, pageTitle, deviceType, browser, beginDate, endDate, os, screenRes,company));
  }