title: How can we access to inputs of ng-select for unit test?
body: <p>My goal is to test if some  inputs like for example [isOpen] or [multiple] are equal to true. </p>
  
  <p>I haven't any idea of how to access at this inputs, I tried by the DOM but it doesn't work.  Please help me . </p>
  
  <pre><code>&lt;ng-select
          [ngModel]="carsInit"
          (change)="changeCars($event)"
          [items]="cars$ | async"
          [clearable]="false"
          [multiple]="true"
          [placeholder]="placeholderCars$ | async"
          [isOpen]="true"
        &gt;&lt;/ng-select&gt;
  </code></pre>