Clean up deprecation tests
Clean up deprecation tests

This cleans up several deprecation tests, especially tests pertaining to
disallowed warnings, to clarify what is being tested.

MSP-Greg/rails,rails/rails,esparta/rails,georgeclaghorn/rails,esparta/rails,MSP-Greg/rails,esparta/rails,esparta/rails,MSP-Greg/rails,georgeclaghorn/rails,rails/rails,georgeclaghorn/rails,rails/rails,georgeclaghorn/rails,rails/rails,MSP-Greg/rails