Angular 2 + ng 测试：“X”不是已知组件[重复]

Question

我使用 Angular 2.0 RTM 和 Angular CLI 1.0.0-beta 16 创建了一个新项目：

ng init

然后跑：

ng generate component my-new-component

然后跑：

ng test

得到了这个：

'app-my-new-component' is not a known element:
1. If 'app-my-new-component' is an Angular component, then verify that it is part of this module.
2. If 'app-my-new-component' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schema' of this component to suppress this message. ("
</h1>
<p>The mean of life is {{answer}}</p>
[ERROR ->]<app-my-new-component></app-my-new-component>"): AppComponent@4:0
Error: Template parse errors:
    at TemplateParser.parse (http://localhost:9877/_karma_webpack_/0.bundle.js:8669:19)
    at RuntimeCompiler._compileTemplate (http://localhost:9877/_karma_webpack_/0.bundle.js:17854:51)
    at http://localhost:9877/_karma_webpack_/0.bundle.js:17777:83
    at Set.forEach (native)
    at compile (http://localhost:9877/_karma_webpack_/0.bundle.js:17777:47)
    at RuntimeCompiler._compileComponents (http://localhost:9877/_karma_webpack_/0.bundle.js:17779:13)
    at RuntimeCompiler._compileModuleAndAllComponents (http://localhost:9877/_karma_webpack_/0.bundle.js:17696:37)
    at RuntimeCompiler.compileModuleAndAllComponentsSync (http://localhost:9877/_karma_webpack_/0.bundle.js:17684:21)
    at TestingCompilerImpl.compileModuleAndAllComponentsSync (http://localhost:9877/_karma_webpack_/0.bundle.js:24662:35)
    at TestBed._initIfNeeded (webpack:///home/adam/monctonug/~/@angular/core/bundles/core-testing.umd.js:1059:0 <- src/test.ts:4568:40)

我尝试重新排序组件，但没有帮助。解决此问题的正确方法是什么？

Answer 1

我也遇到了同样的问题，结果证明你还需要声明使用过的组件：

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