使用Karma在Angular 7中测试应用程序时,我无法删除subj中的错误。
我已经搜索了许多地方(主要是这里),但要么解决方案不起作用,要么与我的情况无关。
App.component.html:
<app-header></app-header>
<router-outlet></router-outlet>Header.component.ts:
import { Component, OnInit, ViewChild, ElementRef, AfterViewInit, EventEmitter, Output } from '@angular/core';
import { Router } from '@angular/router';
import { Location } from '@angular/common';
@Component({
    selector: 'app-header',
    templateUrl: './header.component.html',
    styleUrls: ['./header.component.less']
})
export class HeaderComponent implements AfterViewInit, OnInit {
    constructor(private location: Location, private router: Router) { 
        setInterval(() => {
            this.now = new Date();
        }, 1000);
    }
...
    onKeyDown(event: KeyboardEvent): void {
        event.preventDefault();
        if (event.which === this.KEY_ESCAPE){
            if (this.router.url !== '/'){
                this.location.back();
            }
        }
    }App.component.spec.ts:
import { TestBed, async } from '@angular/core/testing';
import { AppComponent } from './app.component';
import { HeaderComponent } from './header/header.component';
import { RouterOutlet } from '@angular/router';
describe('AppComponent', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        AppComponent,
        HeaderComponent,
        RouterOutlet
      ],
    }).compileComponents();
  }));
  it('should create the app', () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.debugElement.componentInstance;
    expect(app).toBeTruthy();
  });AppComponent should create the app
Error: StaticInjectorError(DynamicTestModule)[HeaderComponent -> Location]: 
  StaticInjectorError(Platform: core)[HeaderComponent -> Location]: 
    NullInjectorError: No provider for Location!发布于 2019-05-28 15:48:56
修复它:我所需要做的就是导入RouterModule.forRoot([]),这似乎是一个常见的错误,因为它修复了很多StaticInjectorError(DynamicTestModule)错误。
发布于 2020-04-30 17:05:57
在我的例子中,我已经在使用RouterTestingModule,这不应该引发这个错误。我从错误的位置导入了位置,所以出现了错误。“‘Location”应从此处导入:
import {Location} from '@angular/common';在您的导入中,您应该只像这样导入RouterTestingModule:
TestBed.configureTestingModule({
      imports: [
        RouterTestingModule.withRoutes(
          [
            {path: 'add', component: DummyComponent, pathMatch: 'full'}
          ]
        )
      ],然后你可以像这样使用Location:
it('Should navigate to / before + button click', () => {
    const location: Location = TestBed.get(Location);
    expect(location.path()).toBe('');
  });别忘了从@angular/common导入位置
发布于 2020-03-24 20:40:05
在测试期间,NullInjectorError: No provider for Location!的替代方法是导入RouterTestingModule。
例如。mycomponent.spec.ts:
    import { RouterTestingModule } from '@angular/router/testing';
    ...
    beforeEach(() => TestBed.configureTestingModule({
            imports: [ RouterTestingModule ]
    }));https://stackoverflow.com/questions/56325514
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