小编hon*_*yer的帖子

我有以下文件集。我正在尝试使用业力和茉莉花进行单元测试。每当我运行“ ng test”时，我都会在业力页面中出现以下错误。

Error: StaticInjectorError(DynamicTestModule)[ConfigService -> HttpClient]: 
  StaticInjectorError(Platform: core)[ConfigService -> HttpClient]: 
    NullInjectorError: No provider for HttpClient!
    at _NullInjector.webpackJsonp../node_modules/@angular/core/esm5/core.js._NullInjector.get (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:1002:1)
    at resolveToken (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:1300:1)
    at tryResolveToken (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:1242:1)
    at StaticInjector.webpackJsonp../node_modules/@angular/core/esm5/core.js.StaticInjector.get (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:1110:1)
    at resolveToken (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:1300:1)
    at tryResolveToken (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:1242:1)
    at StaticInjector.webpackJsonp../node_modules/@angular/core/esm5/core.js.StaticInjector.get (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:1110:1)
    at resolveNgModuleDep (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:10854:1)
    at _createClass (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:10891:1)
    at _createProviderInstance$1 (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/esm5/core.js:10865:1)

app.module.ts

import { ConfigService } from './config-service.service';
import { BrowserModule } from '@angular/platform-browser';
import { NgModule, APP_INITIALIZER } from '@angular/core';
import { FormGroup, FormsModule, FormControl, Validators, ReactiveFormsModule, FormBuilder } from '@angular/forms';
import { RouterModule, …