Hi!
Today faced with such a thing - UnityADS shows usual advertising instead of test (about blacksmith like before). The test mode is enabled in the settings, I check the script Advertisement.testMode, the result is true. Is this a change in the plugin itself, or does the test mode not work? Unity 5.6.0f3 (64-bit)
P.S. I mean ads on device show real ads instead test, in editor all work like before