小编BHA*_*RAT的帖子

我的Angular应用程序正常工作,但是当我运行ng test命令时,我一直收到Karma错误.我已经附加了app组件,规范,模块和html以及package.json文件.错误看起来像这样:

Failed: No provider for ChildrenOutletContexts!
Error: No provider for ChildrenOutletContexts!
at injectionError (http://localhost:9876/_karma_webpack_/vendor.bundle.js:39523:90)
at noProviderError (http://localhost:9876/_karma_webpack_/vendor.bundle.js:39561:12)
at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_._throwOrNull (http://localhost:9876/_karma_webpack_/vendor.bundle.js:41003:19)
at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_._getByKeyDefault (http://localhost:9876/_karma_webpack_/vendor.bundle.js:41042:25)
at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_._getByKey (http://localhost:9876/_karma_webpack_/vendor.bundle.js:40974:25)
at ReflectiveInjector_.webpackJsonp.../../../core/@angular/core.es5.js.ReflectiveInjector_.get (http://localhost:9876/_karma_webpack_/vendor.bundle.js:40843:21)
at resolveNgModuleDep (http://localhost:9876/_karma_webpack_/vendor.bundle.js:47827:25)
at NgModuleRef_.webpackJsonp.../../../core/@angular/core.es5.js.NgModuleRef_.get (http://localhost:9876/_karma_webpack_/vendor.bundle.js:48909:16)
at resolveDep (http://localhost:9876/_karma_webpack_/vendor.bundle.js:49412:45)
at createClass (http://localhost:9876/_karma_webpack_/vendor.bundle.js:49276:32)

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.less']
})
export class AppComponent {
  title = 'app';
}

app.component.html

<a href="http://localhost:4200/dashboard">Dashboard</a>
<a href="http://localhost:4200/user">User</a> 
<router-outlet></router-outlet>

app.component.spec.ts

import { TestBed, async } from …