代码之家 › 专栏 › 技术社区 › dman

在Angular单元测试中似乎无法模拟行为主体

karma-jasmine jasmine rxjs angular

-1

dman · 技术社区 · 1 年前

使用Angular 16和Jasmine/Karma。

我订阅了一个名为的行为主题 tableList$


    ngOnInit() {                                                   
      const { pageNumber } = this.subscribersService.getMiscValues();
      this.subscribersService.initPage(pageNumber);
>>    this.subscribersService.tableList$.subscribe((tableList) => {
        //  this.tableList = this.deleteSubscribersService.setDeleteCheckboxStates(tableList);                    
      });                                                                                
    }

我试图嘲笑行为主体,但我越来越 this.subscribersService.tableList$.subscribe is not a function .

你知道我做错了什么吗?

注意,我也试过 subscribersServiceMock.tableList$.and.returnValue({ subscribe: () => tableListMock$.subscribe }); 没有成功

fdescribe('ManageSubscribersComponent', () => {
  let component: ManageSubscribersComponent;
  let fixture: ComponentFixture<ManageSubscribersComponent>;
  let miscMockValues;
  let tableMockData;
  let tableListMock$;
  let dialogServiceMock
  let dialogSubjectMock;
  let subscribersServiceMock;
  let deleteSubscribersServiceMock;

  const displayedColumns = [
    'id',
    'name',
    'description',
    'createdBy',
    'createdOn',
    'updatedBy',
    'updatedOn',
  ];

  beforeEach(() => {
    tableListMock$ = new Subject();
    dialogSubjectMock = new Subject();

    dialogServiceMock = jasmine.createSpyObj([
      'open',
      'afterClosed',
    ]);

    deleteSubscribersServiceMock = jasmine.createSpyObj([
      'deleteSubscribers',
    ]);


    subscribersServiceMock = jasmine.createSpyObj([
      'resetMiscValues',
      'getMiscValues',
      'initPage',
      'tableList$',
    ]);

    miscMockValues = {
      pageNumber: 1,
      pageSize: 25,
      sort: '',
      active: true,
      testMode: false,
      searchTerms: '',
    };


    subscribersServiceMock.getMiscValues.and.returnValue(miscMockValues);
    subscribersServiceMock.tableList$.and.returnValue(tableListMock$);
    dialogServiceMock.afterClosed.and.returnValue(dialogSubjectMock);

    TestBed.configureTestingModule({
      declarations: [ManageSubscribersComponent],
      imports: [
        HttpClientTestingModule,
        MatFormFieldModule,
        MatIconModule,
        MatSliderModule,
        MatTableModule,
        MatFormFieldModule,
        MatInputModule,
        BrowserAnimationsModule,
        MatPaginatorModule,
        MatDialogModule,
      ],
      schemas: [
        CUSTOM_ELEMENTS_SCHEMA,
        NO_ERRORS_SCHEMA,
      ],
      providers: [
        {
          provide: SubscribersService,
          useValue: subscribersServiceMock,
        },
        {
          provide: DeleteSubscribersService,
          useValue: deleteSubscribersServiceMock,
        },
      ],
    });

    fixture = TestBed.createComponent(ManageSubscribersComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });


  fit('should init', fakeAsync(() => {
    fixture.whenStable().then(() => {
      expect(component.displayedColumns).toEqual(displayedColumns);
      expect(subscribersServiceMock.getMiscValues).toHaveBeenCalled();
    })
  }));

1 回复 | 直到 1 年前

davidlj95 1 年前

正如评论中所述,问题在于测试设置

设置时 SubscribersService 模仿做

subscribersServiceMock = jasmine.createSpyObj([
      'resetMiscValues',
      'getMiscValues',
      'initPage',
      'tableList$',
    ]);

数组中的这些名称将是方法根据 createSpyObj docs

然而, 订阅服务 使用 tableList$ 作为一种财产。因为它确实如此 this.tableList$ 因为它是一种可观察的对象,并且不像使用方法那样调用它: this.tableList$() .

如果你想用你的 tableListMock 主题为 表列表$ 财产 ,您可以使用下一个可选参数 createSpyObj :

subscribersServiceMock = jasmine.createSpyObj([
      'resetMiscValues',
      'getMiscValues',
      'initPage',
    ], { tableList$: tableListMock$ });

As createSpyObj docs 状态,最后一个参数可以定义创建间谍的属性。或者一个对象,用它们在对象中的值来实际定义属性。

您还可以传递一个方法名数组:

subscribersServiceMock = jasmine.createSpyObj([
      'resetMiscValues',
      'getMiscValues',
      'initPage',
      'tableList$',
    ], ['tableList$']);

然后, spies will be created for the property accessor 这样你就可以在什么时候监视 表列表$ 是 get 或 set .

以下是如何配置 得到 间谍,这样 subscribersServiceMock.tableList$ 返回模拟主题:

subscribersServiceMock = jasmine.createSpyObj(
 [
   // method names as ususal
 ], 
 ['tableList$']
);
const tableList$GetterSpy = Object.getOwnPropertyDescriptor(
  subscribersServiceMock,
  'tableList$',
)!.get as jasmine.Spy
tableList$GetterSpy.and.returnValue(mockTableList$)

如果你只想设置值,有点麻烦,之前传递对象的方式更短。通过这种方式,您可以验证 表列表$ 通过使用间谍访问:

expect(tableList$Getter).toHaveBeenCalled()