title: Angular Unit testing : Failed: Unexpected value 'DxTemplateHost' imported by the module 'DynamicTestModule': Add a @NgModule annotation
body: <p>Am implementing a simple unit test for my Component .</p>
  
  <ul>
  <li><p>i imported everything necessary : services , RouterModuleTesting ,FormsModule HttpModule ...</p></li>
  <li><p>Wanna note that I'm using DevExtreme Widgets.</p></li>
  </ul>
  
  <p>but again , i confront some strange error :</p>
  
  <p>the error says that i should add a <strong>@NgModule annotion</strong> somewhere , but it's not clear.</p>
  
  <p><strong>My test file is the following :</strong> </p>
  
  <pre><code>import { async, ComponentFixture, TestBed } from '@angular/core/testing';
  import { CustomersListComponent } from './customers-list.component';
  // DevExtreme Module
  import {DxTemplateHost} from 'devextreme-angular';
  // Router Testing Module
  import {RouterTestingModule} from '@angular/router/testing';
  // Services and HTTM Module
  import { CustomerService } from './../customer.service';
  import {HttpService} from '../../../shared/service/http.service';
  import {SessionService} from '../../../shared/service/session.service';
  import {HttpModule} from '@angular/http';
  // Forms Module (ngModel)
  import {FormsModule} from '@angular/forms';
  // Schemas(datasource error)
  import {CUSTOM_ELEMENTS_SCHEMA} from '@angular/core';
  
  describe('CustomerListComponent', () =&gt; {
    let component: CustomersListComponent;
    let fixture: ComponentFixture&lt;CustomersListComponent&gt;;
  
    beforeEach(async(() =&gt; {
      TestBed.configureTestingModule({
        declarations: [ CustomersListComponent ],
        imports: [
          HttpModule,
          FormsModule,
          DxTemplateHost,
          RouterTestingModule,
        ],
        providers: [ CustomerService , SessionService , HttpService ],
        schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
      })
      .compileComponents();
    }));
  
    beforeEach(() =&gt; {
      fixture = TestBed.createComponent(CustomersListComponent);
      component = fixture.componentInstance;
      fixture.detectChanges();
    });
  
    it('Customer-list component should be well defined', () =&gt; {
      expect(component).toBeDefined();
    });
  });
  </code></pre>
  
  <p>When running Karma serve , the test falis and throws this :</p>
  
  <pre><code>Failed: Unexpected value 'DxTemplateHost' imported by the module 'DynamicTestModule'. Please add a @NgModule annotation.
      Error: Unexpected value 'DxTemplateHost' imported by the module 'DynamicTestModule'. Please add a @NgModule annotation.
          at syntaxError (webpack:///~/@angular/compiler/@angular/compiler.es5.js:1690:21 &lt;- src/test.ts:117724:34)
          at webpack:///~/@angular/compiler/@angular/compiler.es5.js:15383:0 &lt;- src/test.ts:131417:44
          at Array.forEach (&lt;anonymous&gt;)
          at CompileMetadataResolver.Array.concat.CompileMetadataResolver.getNgModuleMetadata (webpack:///~/@angular/compiler/@angular/compiler.es5.js:15366:0 &lt;- src/test.ts:131400:49)
          at JitCompiler.Array.concat.JitCompiler._loadModules (webpack:///~/@angular/compiler/@angular/compiler.es5.js:26796:25 &lt;- src/test.ts:142830:70)
          at JitCompiler.Array.concat.JitCompiler._compileModuleAndAllComponents (webpack:///~/@angular/compiler/@angular/compiler.es5.js:26782:0 &lt;- src/test.ts:142816:36)
          at JitCompiler.Array.concat.JitCompiler.compileModuleAndAllComponentsAsync (webpack:///~/@angular/compiler/@angular/compiler.es5.js:26714:0 &lt;- src/test.ts:142748:37)
          at TestingCompilerImpl.Array.concat.TestingCompilerImpl.compileModuleAndAllComponentsAsync (webpack:///~/@angular/compiler/@angular/compiler/testing.es5.js:478:0 &lt;- src/test.ts:232778:31)
          at TestBed.Array.concat.TestBed.compileComponents (webpack:///~/@angular/core/@angular/core/testing.es5.js:739:0 &lt;- src/test.ts:40380:31)
          at Function.Array.concat.TestBed.compileComponents (webpack:///~/@angular/core/@angular/core/testing.es5.js:622:45 &lt;- src/test.ts:40263:67)
  </code></pre>
  
  <p><strong>Suggestions ??</strong></p>