我尝试为我的Angular2应用程序进行测试。我还没有制作模拟服务,所以我尝试使用我的正常服务。
确切的错误:
Error: No provider for Http!
at injectionError (http://localhost:9876/base/src/test.ts:1538:86) [angular]
at noProviderError (http://localhost:9876/base/src/test.ts:1576:12) [angular]
at ReflectiveInjector_.Array.concat.ReflectiveInjector_._throwOrNull (http://localhost:9876/base/src/test.ts:3077:19) [angular]
at ReflectiveInjector_.Array.concat.ReflectiveInjector_._getByKeyDefault (http://localhost:9876/base/src/test.ts:3116:25) [angular]
at ReflectiveInjector_.Array.concat.ReflectiveInjector_._getByKey (http://localhost:9876/base/src/test.ts:3048:25) [angular]
at ReflectiveInjector_.Array.concat.ReflectiveInjector_.get (http://localhost:9876/base/src/test.ts:2917:21) [angular]
at DynamicTestModuleInjector.Array.concat.NgModuleInjector.get (http://localhost:9876/base/src/test.ts:3864:52) [angular]
我要测试的组件的@component是:
@Component({
selector: 'app-game-board',
templateUrl: './game-board.component.html',
styleUrls: ['./game-board.component.css'],
providers: [GameBoardService]
})
我尝试在spec.ts类(测试)中导入HTTPModule,但我无法让它工作。这是spec.ts的代码
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule } from '@angular/http';
import { GameBoardComponent } from './game-board.component';
import { GameBoardService } from "app/services/gameboardservice";
describe('GameBoardComponent', () => {
let component: GameBoardComponent;
let fixture: ComponentFixture<GameBoardComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [HttpModule], //this is where I try to import the HttpModule
declarations: [ GameBoardComponent ],
providers: [GameBoardService]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(GameBoardComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
});
我也在测试类的提供者中尝试过这个:
providers: [{ provide: Http, useValue: GameBoardService }]
答案 0 :(得分:9)
您仍然需要为测试类提供HTTP,并且您可能希望使用MockBackend。
这是我认为你需要添加的行。
import { MockBackend } from '@angular/http/testing';
import { HttpClient } from '@angular/common/http';
在TestBed.configureTestingModule的提供程序中:
providers: [
{provide: HttpClient, deps: [MockBackend]},
...
],