title: AdMob ads stopped showing
body: <p>I looked at various answers, but nothing works for me. This also may be a dumb question, but I haven't worked with AdMob in 2 years. It did use to show the test ads on the simulator, until I ran it on a physical device. I know that it won't show the real ads on the physical device, but now test ads do not show on the simulator. However I have the view set to a grey color and the ad view is white on the simulator. This makes me believe they are still working. I do get the below printed in the console. Doing that won't show test ads though.</p>
  <p>To get test ads on this device, set: GADMobileAds.sharedInstance.requestConfiguration.testDeviceIdentifiers = @[ kGADSimulatorID ];</p>
  <p>code:</p>
  <pre><code>let banner: GADBannerView = {
          let banner = GADBannerView()
          banner.load(GADRequest())
          banner.backgroundColor = .secondarySystemBackground
          banner.adUnitID = Constants.appBanner
          return banner
      }()
  </code></pre>
  <p>called in viewDidLoad:</p>
  <pre><code>banner.rootViewController = self
  view.addSubview(banner)
  </code></pre>
  <p>My question is if I am doing anything wrong, or if I am being paranoid.</p>