I inherited a django project which has mostly 'unit' tests that flex the ORM and the db, so they are really integration tests and are painfully slow. There is some important logic that happens in the ORM layer and that needs to be tested. At some point I want to find the time to mock the database so that they can be faster, but in some cases I worry about missing important interactions. Domain is highly specialized so not very easy to just know how to untangle the mess.