[英]Angular 9 - Error: StaticInjectorError[Http]: StaticInjectorError[Http]: NullInjectorError: No provider for Http
我是 Angular 测试的新手。 现在我正在尝试测试服务。 当我为我的单元测试运行ng test
并且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!
这是我的规范文件:
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 '../';
您正在从@angular/common
注入http
模块,但您已经导入了@angular/http
模块。
改成这样:
import { Headers, Http } from '@angular/common/http';
你只需要这个:
imports: [HttpClientTestingModule],
或者代替实际的ContactService
你可以模拟它:
class MockContactService {
// properties and methods to mock
}
现在你可以在你的提供者中使用它:
providers: [
{
provide: ContactService,
useClass: MockContactService
}
]
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