title: Angular - setValue FormControl return [object ErrorEvent] thrown
body: <p>I have a Form that has a FormControl:</p>
  
  <pre class="lang-js prettyprint-override"><code>this.description = new FormControl('', [Validators.required, Validators.minLength(10), Validators.maxLength(250)]);
  
  this.adForm = new FormGroup({
    description: this.description
  });
  </code></pre>
  
  <p>The HTML representation of the FormControl is:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;label for="description"&gt;Description&lt;/label&gt;
  &lt;input formControlName="description" id="description" class="form-control description" type="text" placeholder="Description"&gt;
  </code></pre>
  
  <p>And I'm coding a test to validate the FormControl.
  The test is like:</p>
  
  <pre class="lang-js prettyprint-override"><code>const descriptionControl = component.adForm.controls['description'];
  descriptionControl.setValue('longDescription-longDescription-longDescription-longDescription-');
  fixture.detectChanges();
  </code></pre>
  
  <p>I'm using the method "setValue" to set the value of the input.
  The problem is that with some values the method return:</p>
  
  <pre><code>[object ErrorEvent] thrown
  </code></pre>
  
  <p>This is the image of the error:</p>
  
  <p><a href="https://i.stack.imgur.com/Zt3pm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Zt3pm.png" alt="enter image description here"></a></p>
  
  <ul>
  <li>If I put descriptionControl.setValue('descriptio'); It works
  fine, not return the error. </li>
  <li><p>If I put descriptionControl.setValue('description'); return  [object
  ErrorEvent] thrown</p></li>
  <li><p>If I put a long value like this:
     descriptionControl.setValue('description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-description-'); It works fine, not return the error.</p></li>
  </ul>
  
  <p>Could explain me what is happening or if I'm using the method in wrong way?Thanks!</p>