Is your feature request related to a problem? Please describe.
follow-up of Project-MONAI/tutorials#296,
this ticket looks for an integration test as a simplified version of tutorial Project-MONAI/tutorials#296 so that the pathology related modules are easier to maintain.

cc @drbeh

Additional context
https://github.com/Project-MONAI/MONAI/tree/dev/monai/apps/pathology