refactor integration/unit tests

[rshewitt]

User Story

In order to better organize the harvesting logic app tests datagov wants to isolate the integration tests which exist as unit tests.

Acceptance Criteria

[ACs should be clearly demoable/verifiable whenever possible. Try specifying them using BDD.]

• GIVEN the harvesting logic app tests
  WHEN a reorganization of the unit and integration tests happens
  THEN integration tests will be separate from unit tests \

Background

• this ticket really only involves the db tests. they should be moved to integration tests.
• we currently only run unit tests in our action (source). we may want to consider including the integration tests because we have some control over them ( i.e. we setup the postgres instance via our compose file and have a cloud foundry instance to interact with )

Security Considerations (required)

[Any security concerns that might be implicated in the change. "None" is OK, just be explicit here!]

Sketch

• move test_db.py from the unit test into the integration tests
• include integration tests when running pytest