Detect subclass overrides of cleanup methods#560

Merged

MSeal merged 4 commits intojupyter:masterfrom kevin-bates:detect-subclass

Jul 13, 2020

+135-11

Commits on Jul 10, 2020

Detect subclass overrides of cleanup methods
kevin-bates
committed

Commits on Jul 11, 2020

Add tests for subclass handling of cleanup method
kevin-bates
committed

Commits on Jul 13, 2020