在angular2中测试router-outlet组件

发布时间：2020-12-17 07:30:11 所属栏目：安全来源：网络整理

导读：我有一个html所在的homecomponent //home.component.html router-outlet/router-outlet //home.component.ts import { Component,OnInit } from '@angular/core';import { Router } from '@angular/router';import { HomeService} from './shared/services/h

我有一个html所在的homecomponent

//home.component.html

<router-outlet></router-outlet>

//home.component.ts

import { Component,OnInit } from '@angular/core';
import { Router } from '@angular/router';

import { HomeService} from './shared/services/home.service';

@Component({
  // moduleId: module.id,selector: 'app-home',templateUrl: 'home.component.html',styleUrls: ['home.component.css'],providers:[HomeService]
})
export class HomeComponent implements OnInit {

  constructor(private service:HomeService,private route:Router) { }

  ngOnInit() {
    if(this.service.isAuthenticated()){
      this.route.navigateByUrl('dashboard/main');
    }
  }
}

//home.component.spec.ts

import { ComponentFixture,TestBed  } from '@angular/core/testing';
import { By }              from '@angular/platform-browser';
import { DebugElement }    from '@angular/core';
import { async,inject } from '@angular/core/testing';
import { HomeComponent } from './home.component';
import { Router} from '@angular/router';
import { HomeService } from './shared/services/home.service';

class RouterStub {
    navigateByUrl(url: string) { return url }
}

class MockHomeService {
    isAuthenticated() {
        return true
    }
}

let comp: HomeComponent;
let fixture: ComponentFixture<HomeComponent>;


describe('Component: HomeComponent',() => {


    beforeEach(() => {
        TestBed.configureTestingModule({

            declarations: [HomeComponent],providers: [
                { provide: Router,useClass: RouterStub },{ provide: HomeService,useClass: MockHomeService },]
        });

        fixture = TestBed.createComponent(HomeComponent);
        comp = fixture.componentInstance;

    });

    it('should tell ROUTER to navigate to dashboard/main if authencated',inject([Router,HomeService],(router: Router,homeservice: HomeService) => {
            const spy = spyOn(router,'navigateByUrl');
            comp.ngOnInit();
            if (homeservice.isAuthenticated()) {
                const navArgs = spy.calls.first().args[0];
                expect(navArgs).toBe('dashboard/main');
            }


        }));
});

我收到以下错误

Error: Template parse errors:
        'router-outlet' is not a known element:
        1. If 'router-outlet' is an Angular component,then verify that it is pa
rt of this module.
        2. If 'router-outlet' is a Web Component then add "CUSTOM_ELEMENTS_SCHEM
A" to the '@NgModule.schema' of this component to suppress this message. ("<div
class="">
            [ERROR ->]<router-outlet></router-outlet>
        </div>
        "): HomeComponent@1:4
            at TemplateParser.parse (http://localhost:9876/_karma_webpack_/0.bun
dle.js:21444:19)
            at RuntimeCompiler._compileTemplate (http://localhost:9876/_karma_we
bpack_/0.bundle.js:6569:51)
            at http://localhost:9876/_karma_webpack_/0.bundle.js:6492:83
            at Set.forEach (native)
            at compile (http://localhost:9876/_karma_webpack_/0.bundle.js:6492:4
7)
            at RuntimeCompiler._compileComponents (http://localhost:9876/_karma_
webpack_/0.bundle.js:6494:13)
            at RuntimeCompiler._compileModuleAndAllComponents (http://localhost:
9876/_karma_webpack_/0.bundle.js:6411:37)
            at RuntimeCompiler.compileModuleAndAllComponentsSync (http://localho
st:9876/_karma_webpack_/0.bundle.js:6399:21)
            at TestingCompilerImpl.compileModuleAndAllComponentsSync (http://loc
alhost:9876/_karma_webpack_/0.bundle.js:10203:35)
            at TestBed._initIfNeeded (webpack:///D:/myapp/transfer(9)/transfer/~
/@angular/core/bundles/core-testing.umd.js:1059:0 <- src/test.ts:4943:40)

我在做什么错？

提前致谢

该错误是因为< router-outlet>在部分RouterModule1中,未导入到您的测试台配置中.

如果你不关心测试任何实际的实际路由(我注意到模拟路由器),那么你可以让Angular忽略< router-outlet>通过在测试床配置中添加以下元素.

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

TestBed.configureTestingModule({
  schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
});

只是一个建议.您希望测试组件上的行为,并且行为是在创建组件并对用户进行身份验证时,应该调用路由器导航方法.所以我们应该测试一下调用导航方法.我们怎么做？使用Spies.您可以通过navigateByUrl方法创建一个间谍,然后您可以使用jasmine检查该方法是否被调用

import { getTestBed } from '@angular/core/testing';

class RouterStub {
  navigateByUrl = jasmine.createSpy('navigateByUrl');
}

it('should navigate',() => {
  fixture.detectChanges();
  let router: Router = getTestBed().get(Router);
  expect(router.navigateByUrl).toHaveBeenCalledWith('dashboard/main');
});

UPDATE

现在你得到一个缺少的Http提供程序错误.

因为@Component上有提供者：[HomeService],它会覆盖测试模块配置中的提供者(即模拟).在这种情况下,您应该覆盖组件提供程序

TestBed.configureTestingModule({});
TestBed.overrideComponent(HomeComponent,{
  set: {
    providers: [
      { provide: HomeService,useClass: MockHomeService }
    ]
  }
})

1 – 对于测试,它实际上应该是RouterTestingModule,如here所述

（编辑：李大同）

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