Can you add test devices to these and if so, how?
So here you go:
// request test interstitial ads
AdRequest adRequestInterstitial = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.addTestDevice(testDeviceId)
.build();
// request test banner ads
AdRequest adRequestBanner = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.addTestDevice(testDeviceId)
.build();