Question

我正在尝试开始测试我的组件。我要测试的第一件事是ngOnInit是否调用了正确的服务。

agreement.component.ts ：

  constructor(private agreementService: AgreementService,
              private operatorService: OperatorService,
              private accountService: AccountService,
              private route: ActivatedRoute,
              private router: Router,
              private sessionService: SessionService,
              private settingsService: SettingsService) {
    this.agreementId = Number(this.route.snapshot.paramMap.get('agreementId'));
  }

  async ngOnInit() {
    this.session = await this.sessionService.getSession();
    this.settings = await this.settingsService.getSettings();

    this.operatorService.getOperators(this.session.bic).subscribe(data => {
      this.operators = data;
    });
  ...
  }

agreement.component.spec.ts

import {AgreementComponent} from './agreement.component';
import {async, TestBed} from '@angular/core/testing';
import {ActivatedRoute, convertToParamMap, Router} from '@angular/router';
import {RouterTestingModule} from '@angular/router/testing';
import {AgreementService} from '../../../services/agreement.service';
import {AccountService} from '../../../services/account.service';
import {SessionService} from '../../../services/session.service';
import {SettingsService} from '../../../services/settings.service';

describe('agreementComponent', () => {
  let mockAgreementService: AgreementService;
  let mockOperatorService;
  let mockAccountService: AccountService;
  let mockRoute: ActivatedRoute;
  let mockRouter: Router;
  let mockSessionService: SessionService;
  let mockSettingsService: SettingsService;
  let component: AgreementComponent;

  beforeEach(async(() => {
    mockAgreementService = jasmine.createSpyObj(['getAgreement']);
    mockOperatorService = jasmine.createSpyObj(['getOperators']);
    mockAccountService = jasmine.createSpyObj(['getFeeAccounts']);
    mockRoute = jasmine.createSpyObj(['route']);
    mockRouter = jasmine.createSpyObj(['router']);
    mockSessionService = jasmine.createSpyObj(['getSession']);
    mockSettingsService = jasmine.createSpyObj(['getSettings']);

    TestBed.configureTestingModule({
      declarations: [AgreementComponent],
      imports: [
        RouterTestingModule
      ],
      providers: [
        {
          provide: ActivatedRoute, useValue:
            {
              snapshot: {
                paramMap: convertToParamMap({agreementId: '0'})
              }
            }
        },
      ]
    });

    component = new AgreementComponent(mockAgreementService, mockOperatorService, mockAccountService,
      mockRoute, mockRouter, mockSessionService, mockSettingsService);
  }));


  it('should call operators service', () => {
    component.ngOnInit();

    expect(mockOperatorService).toHaveBeenCalled();

  });
});

当前，我得到：

失败：无法读取未定义的属性'paramMap'

TypeError：无法读取未定义的属性'ngOnInit'

我真的确定这段代码缺少很多东西才能正常工作，我只是无法弄清楚到底缺少了什么，应该采取什么措施，因为谷歌搜索我的错误使我困惑于很多不同之处解决方案。我对角度测试还很陌生，所以想对如何以正确的方式编写测试提出一些建议。

Answer 1

按照one of my articles中的说明通过创建存根来采用另一种方法。

创建的可重复使用的存根为：

enum {
 p2 = 0,
 p1 = 1
}

等等，用于其他其他服务。

在export class MockOperatorService{ getOperators(){ return of({data: "someVal"}) } }中按需使用RouterTestingModule
模拟imports和其他服务，如下所示：

ActivatedRoute

我意识到缺少适当的文章集来学习角度测试，因此我写了collection of articles which you can find on the bottom of this page。希望对您有帮助

更新：

要监视评论中的内容，您可以执行以下操作：


  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [AgreementComponent],
      imports: [
        RouterTestingModule
      ],
      providers: [
        {
          provide: ActivatedRoute, useValue:
            {
              snapshot: {
                paramMap: convertToParamMap({agreementId: '0'})
              }
            }
        },
        {provide: OperatorService , useClass: MockOperatorService},
        {....similarly for AgreementService etc etc}
      ]
    });
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(AgreementComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

具有业力的Angular 8测试组件失败

1 个答案:

更新：