Verification - fan-ADN/nendSDK-cocos2d-x GitHub Wiki
By setting the display test apiKey and spotID for Android app, you can check whether ads can be displayed properly or not even though the status of the ad space for your application is “pending” (not active).
After the verification, please make sure to re-write the apiKey and spotID to each app's ad space.
The performance of the ads will not be added up correctly if you apply your app to the app store with the test ID. If you have applied with the test ID by mistake, please understand that nend will not take any responsibility.
The simplest way to duplicate the ad reception error is to make it offline.
Nend SDK does not check the online status at the moment, so when handling something while offline
implementation has to be done on the application side.