我正在使用 CLI 启动一个新的 Angular 项目,但遇到了
HttpClient
错误的无提供程序。
我已将
HttpClientModule
添加到我的模块导入中,这似乎是这种情况下的常见罪魁祸首。除此之外,在网上找不到太多信息,所以我不确定问题可能是什么。
我的app.module.ts
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
HttpClientModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
和我的服务
@Injectable()
export class FlexSearchService {
constructor(private http: HttpClient) {}
getSavedSearchResult(index: string, queryName: string, query: string ): Observable<any> {
const url = `${environment.flexUrl}/${index}/search`;
const item = new SearchQuery({queryName: queryName, variables: {q: query}});
return this.http.post(url, item);
}
}
ng 版本给出以下输出
@angular/cli: 1.4.2
node: 6.9.4
os: darwin x64
@angular/animations: 4.4.4
@angular/common: 4.4.4
@angular/compiler: 4.4.4
@angular/core: 4.4.4
@angular/forms: 4.4.4
@angular/http: 4.4.4
@angular/platform-browser: 4.4.4
@angular/platform-browser-dynamic: 4.4.4
@angular/router: 4.4.4
@angular/cli: 1.4.2
@angular/compiler-cli: 4.4.4
@angular/language-service: 4.4.4
typescript: 2.3.4
我的 tsconfig
{
"compileOnSave": false,
"compilerOptions": {
"outDir": "./dist/out-tsc",
"sourceMap": true,
"declaration": false,
"moduleResolution": "node",
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"target": "es5",
"typeRoots": [
"node_modules/@types"
],
"lib": [
"es2017",
"dom"
]
}
}
我的测试
import { TestBed, inject } from '@angular/core/testing';
import { HttpClientModule } from '@angular/common/http';
import { FlexSearchService } from './flex-search.service';
describe('FlexSearchService', () => {
beforeEach(() => {
TestBed.configureTestingModule({
providers: [FlexSearchService, HttpClientModule]
});
});
it('should be created', inject([FlexSearchService], (service: FlexSearchService) => {
expect(service).toBeTruthy();
}));
非常感谢任何帮助!
在你的测试中
TestBed.configureTestingModule({
providers: [FlexSearchService, HttpClientModule]
});
应该是
TestBed.configureTestingModule({
imports: [HttpClientModule],
providers: [FlexSearchService]
});
甚至更好(如果你想模拟请求):
TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
providers: [FlexSearchService]
});
导入 HttpClientTestingModule。
在您的测试中:
import { HttpClientTestingModule } from '@angular/common/http/testing';
并在测试的configureTestingModule中执行以下操作:
TestBed.configureTestingModule({
imports: [ HttpClientTestingModule ],
})
.compileComponents();
更简单的方法是全局提供它......将以下内容导入到 app.module.ts 中,如下所示:
import { HttpModule } from '@angular/http'
import { HttpClient, HttpClientModule } from '@angular/common/http';
并在进口中申报:
imports: [
HttpModule,
HttpClientModule, ...
]
为此,您必须导入以下内容:
import { HttpClientTestingModule } from '@angular/common/http/testing';
对于测试的
configureTestingModule
中的规范文件,请执行以下操作:
TestBed.configureTestingModule({
imports: [ HttpClientTestingModule ],
})
.compileComponents();
当我尝试使用 npm 链接在项目中本地链接我的角度库时,我注意到了这个问题。
从存储库下载库解决了我的问题。
对于任何在升级 Angular 版本后来到这里并发现
HttpClientTestingModule
已弃用的人,您可以使用 provideHttpClient()
和 provideHttpClientTesting()
代替。
providers: [
provideHttpClient(),
provideHttpClientTesting(),
]