问题描述
我是Angular测试的新手。现在,我正在尝试测试服务。
当我为单元测试运行ng test
时,以及当这些测试使用该服务时,
我收到错误消息:
Error: StaticInjectorError[Http]:
StaticInjectorError[Http]:
NullInjectorError: No provider for Http!
这是我的规格文件:
import { Testbed,inject } from "@angular/core/testing";
import { ContactService } from "./contact.service";
import { HttpClientTestingModule,HttpTestingController } from '@angular/common/http/testing';
import {HttpClientModule} from '@angular/common/http';
describe("ContactService",() => {
beforeEach(() => {
Testbed.configureTestingModule({
imports: [HttpClientTestingModule,HttpClientModule],providers: [ContactService],});
});
it("should ...",inject([ContactService],(service: ContactService) => {
expect(service).toBeTruthy();
}));
});
这是我的.sevice.ts文件导入:
import { Headers,Http } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { Contact } from '../';
解决方法
您正在从http
注入@angular/common
模块,但是您已经导入了@angular/http
模块。
更改为此:
import { Headers,Http } from '@angular/common/http';
而您只需要这个:
imports: [HttpClientTestingModule],
或者代替实际的ContactService
,您可以对其进行模拟:
class MockContactService {
// properties and methods to mock
}
现在您可以在提供商中使用它了
providers: [
{
provide: ContactService,useClass: MockContactService
}
]