Django: Managing several related test states in Django

Using Django:

I need to create (by inserting some rows into an empty (is it really created empty?) DB) a state X of the DB.

Then I need to run a test against this state.

Then I need to create a state Y by applying some modifications to state X and run another test against Y.

Then I may need to create more test states based on X and/or Y and run tests for them.

How to do this with Django testing framework?