title: Can't bind to 'ngModel' since it isn't a known property of 'quill-editor'
body: <p>I am getting error <code>Can't bind to 'ngModel' since it isn't a known property of 'quill-editor'</code> in my app-component-spec.ts<code>for line</code>[ERROR ->]
  
  <p>The line code in the <code>QuestionListComponent.html</code> is </p>
  
  <p><code>&lt;quill-editor class="description-row" [style]="editorStyle" [readOnly]="true" [modules]="editorConfig" [(ngModel)]="question.description"&gt;&lt;/quill-editor&gt;</code></p>
  
  <p><code>quill-editor</code> is part of <code>component</code>QuillEditorComponent<code>defined in</code>QuillModule<code>which I have imported in</code>app.module.ts`.</p>
  
  <pre><code>imports: [
      AceEditorModule,
      QuillModule,
  </code></pre>
  
  <p>Why am I still getting the error? If I add <code>QuillEditorComponent</code> explicitly again in my test then I get error</p>
  
  <pre><code>TestBed.configureTestingModule({
        declarations: [
          AppComponent,
  QuillEditorComponent
        ],
        imports: [
          AppRoutingModule,
          QuillModule,
  ]
  ...
  });
  </code></pre>
  
  <p><code>Type QuillEditorComponent is part of the declarations of 2 modules: QuillModule and DynamicTestModule! Please consider moving QuillEditorComponent to a higher module that imports QuillModule and DynamicTestModule. You can also create a new NgModule that exports and includes QuillEditorComponent then import that NgModule in QuillModule and DynamicTestModule.</code></p>
  
  <p>If I remove the code <code>[(ngModel)]="question.description"</code> then the code compiles. I am unable to understand what is wrong.</p>