title: Identify the test device for Admob
body: <p>I use the code below: </p>
  
  <p><code>let request : GADRequest = GADRequest ()</code></p>
  
  <p><code>request.testDevices = ["xxxxxxx",kGADSimulatorID]</code></p>
  
  <p>But I am getting the below warning:</p>
  
  <blockquote>
    <p>'testDevices' is deprecated: Use GADMobileAds.sharedInstance.requestConfiguration.testDeviceIdentifiers.</p>
  </blockquote>
  
  <p>Do I use a syntax to remove the warning?</p>