'pattern-list' is not a known element:
  1. If 'pattern-list' is an Angular component,then verify that it is part of this module.
  2. If 'pattern-list' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schema' of this component to suppress this message. ("
         [ERROR ->]<pattern-list></pattern-list>

当我刚用“npm-start”运行应用程序时,我首先遇到了这个问题,我解决了在声明部分向app.module添加所需组件的问题.但现在,因为我想测试我得到相同的错误,我不知道为什么.
这是我的代码：

app.module.ts

@NgModule({
  imports: [ BrowserModule,FormsModule,HttpModule,ReactiveFormsModule ],declarations: [ AppComponent,PatternListComponent,PatternDetailComponent,WidgetListComponent,FormComponent,DefaultWidget,LabelComponent,CheckBoxWidget ],bootstrap: [ AppComponent ],providers: [ WidgetService ]
})
export class AppModule { }

app.component.ts

@Component({
     selector: 'my-app',template: `
           <pattern-list></pattern-list>
          `
    })
    export class AppComponent { }

pattern.list.component：

@Component({
  selector: 'pattern-list',template: `
    <div class="patterns">
      <pattern-detail *ngFor="let p of patternDetails" [Metadata]="p" 
        (selectPattern)="selectPattern(p)"></pattern-detail>
    </div>
    <div *ngIf="selectedPattern" class="widget-list">
      <widget-list [pattern]="selectedPattern">
      </widget-list>
    </div>
  `,styleUrls: ['/css/styles.css']
})
export class PatternListComponent implements OnInit{
  selectedPattern: PatternDetails;
  constructor(private http: Http) {
  }

  patternDetails: PatternDetails[];

  ngOnInit() {
    this.getPatterns();
  }

  getPatterns() {
    this.http.get('/app/assets/patternDetails.json')
      .map((res:Response) => res.json() )
      .subscribe(
        data => { this.patternDetails = data.patternList; },err => console.error('The problem is: ' + err),() => console.log('done')
      );
    console.log(this.patternDetails);
  }

  selectPattern(pattern: PatternDetails) {
    this.selectedPattern = pattern;
    this.setSelectedProperty(pattern);
  }

  setSelectedProperty(selectedPattern: PatternDetails) {
    for (var p in this.patternDetails) {
      if (this.patternDetails[p] == selectedPattern) {
        this.patternDetails[p].selected = true;
      } else {
        this.patternDetails[p].selected = false;
      }
    }
  }
}

我的测试文件：app.component.spec.ts

describe('AppComponent with TCB',function () {
  beforeEach(() => {
    TestBed.configureTestingModule({declarations: [AppComponent]});
  });
  describe('asdfasdf',function () {
    beforeEach(async(() => {
      TestBed.compileComponents();
    }));
    it('should instantiate component',() => {
      let fixture = TestBed.createComponent(AppComponent);
      expect(fixture.componentInstance instanceof AppComponent).toBe(true,'should create AppComponent');
    });
  });
});

我正在使用webpack,我不确定这是否重要.