angular6 - 非法状态 : Could not load the summary for directive AppComponent

Question

我正在以 angular 编写 spec.ts 文件并收到以下错误:

Failed: Illegal state: Could not load the summary for directive AppComponent.

下面是我试过的代码

import { TestBed, async } from "@angular/core/testing";
    import { AppComponent } from "./app.component";

    describe('AppComponent', () => {
        beforeEach(() => {
            TestBed.configureTestingModule({
                declarations: [
                    AppComponent
                ],
            });
        });
    });

    it('should create the app', async(() => {
        let fixture = TestBed.createComponent(AppComponent);
        let app = fixture.debugElement.componentInstance;
        expect(app).toBeTruthy();
    }));``

Answer 1

您似乎正在使用一个包含其他组件的组件。您必须添加您在 AppComponent 中使用的所有组件在 declaration的 configureTestingModule