Angular + (Jasmine/Karma) - 错误 : Illegal state: Could not load the summary for directive

Question

我真的在努力解决这个错误，目前互联网上没有任何帮助...

lr-categories.component.spec.ts:

export function main() {
  describe('LrCategoriesComponent', () => {
    let fixture: ComponentFixture<LrCategoriesComponent>;
    let component: LrCategoriesComponent;
    let de: DebugElement;
    let glService: GeneralLedgeService;
    let lrService: LrService;
    let spy: jasmine.Spy;

    beforeEach(async(() => {
      TestBed.configureTestingModule({
        declarations: [
          LrComponent,
          LrMappingsComponent,
          LrCategoriesComponent,
        ],
        imports: [
          CommonModule,
          SharedModule,
          LrRoutingModule,
          AgGridModule.withComponents(
            [
              ButtonComponent,
              ColumnHeaderComponent,
              TypeaheadEditorComponent,
              ButtonGroupComponent
            ]
          )
        ],
        providers: [
          LrService,
          { provide: GeneralLedgeService, useClass: MockGeneralLedgeService },
          CompleterService,
        ]
      }).compileComponents().then(() => {
        // initialization
        fixture = TestBed.createComponent(LrCategoriesComponent);
        component = fixture.componentInstance;
        de = fixture.debugElement;

        // Service getters
        glService = de.injector.get(GeneralLedgeService);
        lrService = de.injector.get(LrService);
      });
    }));

    // beforeEach(() => {
    //   // initialization
    //   fixture = TestBed.createComponent(LrCategoriesComponent);
    //   component = fixture.componentInstance;
    //   de = fixture.debugElement;
    //
    //   // Service getters
    //   glService = de.injector.get(GeneralLedgeService);
    //   lrService = de.injector.get(LrService);
    // });

    it('should create LrCategoriesComponent', (() => {
      expect(component).toBeDefined();
    }));
  });
}

错误:

ERROR: 'Unhandled Promise rejection:', 'Illegal state: Could not load the summary for directive LrCategoriesComponent.'

接受任何建议!我现在很绝望!

Answer 1

我找到了一个解决方案，我将向您介绍它(解决方案是第 3 点):

<强>1。我从 .compileComponents().then(() => {...}); 移动了初始化的东西至 beforeEach(() => {...}); . (你可以看到它被评论了)

export function main() {
  describe('LrCategoriesComponent', () => {
    let fixture: ComponentFixture<LrCategoriesComponent>;
    let component: LrCategoriesComponent;
    let de: DebugElement;
    let glService: GeneralLedgeService;
    let lrService: LrService;
    let spy: jasmine.Spy;

    beforeEach(async(() => {
      TestBed.configureTestingModule({
        // Module's stuff here
      }).compileComponents();
    }));

    beforeEach(() => {
      // initialization
      fixture = TestBed.createComponent(LrCategoriesComponent);
      component = fixture.componentInstance;
      de = fixture.debugElement;

      // Service getters
      glService = de.injector.get(GeneralLedgeService);
      lrService = de.injector.get(LrService);
    });

    it('should create LrCategoriesComponent', (() => {
      expect(component).toBeDefined();
    }));
  });
}

这给了我以下错误:

Error: This test module uses the component ToolBarComponent which is using a "templateUrl" or "styleUrls", but they were never compiled.

此错误是因为在 SharedModule 中声明的组件之一编译时出现问题(实际上，这发生在 declarations[] 的 SharedModule 中的任何组件)。

因此，我开始寻找解决导入时规范文件设置的方法 SharedModule (或其他重型模块)。

<强>2。我找到了一种新方法 here :

const oldResetTestingModule = TestBed.resetTestingModule;
    beforeAll(done => (async () => {
      TestBed.resetTestingModule();
      TestBed.configureTestingModule({
       // Module's stuff here
      });
      await TestBed.compileComponents();

      // prevent Angular from resetting testing module
      TestBed.resetTestingModule = () => TestBed;
    })().then(done).catch(done.fail));

    afterAll(() => {
      // reinstate resetTestingModule method
      TestBed.resetTestingModule = oldResetTestingModule;
      TestBed.resetTestingModule();
    });

尽管它最终解决了所有问题并且以惊人的速度(5 秒对之前的 20 秒)，这种方法有一个主要缺点 : 依赖项每 describe() 创建一次，不是每个测试。这意味着您继承了上一个测试用例的状态。我们不希望这样!

3. 我回到原点，试图理解和应用更智能的异步逻辑...:

- 解决方案 -

beforeEach(done => (async () => {
      TestBed.configureTestingModule({
        // Module's stuff here, including SharedModule
      });
      await TestBed.compileComponents();
    })().then(done).catch(done.fail));

    beforeEach(() => {
      // initialization
      fixture = TestBed.createComponent(LrCategoriesComponent);
      component = fixture.componentInstance;
      de = fixture.debugElement;

      // Service getters
      glService = de.injector.get(GeneralLedgeService);
      lrService = de.injector.get(LrService);
    });

通过玩 async / await 在尝试编译组件 之前，我确保模块 已正确配置。

有了这个，我设法编译了组件，并拥有了一个全新的实例来测试每个测试用例场景!