业力：Angular 4 没有服务提供者

Question

您好想在我的 Angular 组件中测试真正的服务。但我得到以下错误。 Service blservice 没有提供者

import {async, getTestBed,TestBed, inject } from '@angular/core/testing';

import { BlService } from './bl.service';
import { Injectable } from '@angular/core';
import { BaseRequestOptions, Http, Response, ResponseOptions, XHRBackend} from '@angular/http';

describe('BlService', () => {

  beforeEach(() => {TestBed.configureTestingModule({
    providers: [BlService]
   });
  });

  it('should be created', inject([BlService], (service: BlService) => {
    expect(service).toBeTruthy();
  }));
});

错误：

错误：没有 BlService 的提供者！错误：没有 BlService 的提供者！
在 ReflectiveInjector_.prototype._throwOrNull (http://localhost:9876/_karma_webpack_/vendor.bundle.js:42115:13)
在 ReflectiveInjector_.prototype._getByKeyDefault (http://localhost:9876/_karma_webpack_/vendor.bundle.js:42154:13)
在 ReflectiveInjector_.prototype._getByKey (http://localhost:9876/_karma_webpack_/vendor.bundle.js:42086:13)
在 ReflectiveInjector_.prototype.get (http://localhost:9876/_karma_webpack_/vendor.bundle.js:41955:9) 在 解决NgModuleDep (http://localhost:9876/_karma_webpack_/vendor.bundle.js:48958:5) 在 NgModuleRef_.prototype.get (http://localhost:9876/_karma_webpack_/vendor.bundle.js:50028:9)

Answer 1

这样解决：

import {async} from '@angular/core/testing';


beforeEach(async(() => {
  TestBed.configureTestingModule({
    providers: [BlService]
  });
}));