old_contents: """Testing the models."""
  
  
  class TestExerciseModel:
  
      def test_exercise_can_be_saved(self, db):
          # GIVEN any state
          # WHEN adding a new exercise to the database
          # THEN it works
          pass
  
new_contents: """Testing the models."""
  
  
  class TestExerciseModel:
  
      pass
  
subject: Remove unnecessary test