Remko :
The recommended path for upgrading a Python 2 AppEngine app to the new runtime is to switch datastore code to Google Cloud NDB. However, I can't find anything about unit testing code that uses Cloud NDB (which was previously possible using the Python 2 testbed library).
How can Cloud NDB code be unit tested? (apart from standard abstracting the Cloud NDB dependency yourself)
Remko :
Apparently, there is no way to unit test Cloud NDB code anymore. The only testing solution available is the Cloud Datastore Emulator.