Angular 4 Error: No provider for ChildrenOutletContexts in Karma-Jasmine Test

Question

My Angular application is working properly, but I am keep getting Karma error when I run ng test command. I have attached app component, spec, module and html a

Answer 1

Based on the clue provided by @John, I imported RouterTestingModule instead of importing RouterModule and APP_BASE_HREF. So, the following modification in app.component.spec.ts worked!

import { TestBed, async } from '@angular/core/testing';
import { FormsModule } from '@angular/forms';
import { RouterTestingModule } from '@angular/router/testing';

import { AppComponent } from './app.component';
import { DashboardComponent } from './modules/dashboard/dashboard.component';

describe('AppComponent', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        RouterTestingModule 
        FormsModule
      ],
      declarations: [
        AppComponent,
        DashboardComponent
      ]
    }).compileComponents();
  }));