Testing CloudKit error handling and retry functionality

Hi,

I have implemented retry functionality to my app's CloudKit error handling as presented in WWDC 2016 CloudKit Best Practises video at 39:10.

Now I was wondering how could this be tested with CloudKit dev container. More specifically, how to re-create CKErrors

- serviceUnavailable

- requestRateLimited

- zoneBusy

Failed to find any documentation or previous discussion about this topic.

-J