old_contents: #!/usr/bin/env python
  """
  This file demonstrates writing tests using the unittest module. These will pass
  when you run "manage.py test".
  
  Replace this with more appropriate tests for your application.
  """
  from django.test import TestCase
  
  
new_contents: #!/usr/bin/env python
  """
  This module contains tests for djenerator app.
  """
  from django.test import TestCase
  from model_reader import is_instance_of_model
  from models import ExtendingModel
  from models import NotExtendingModel
  from models import TestModel0
  from models import TestModel1
  from models import TestModelA
  from models import TestModelB
  from models import TestModelC
  from models import TestModelD
  from models import TestModelE
  from models import TestModelX
  from models import TestModelY
  
  
  class TestInstanceOfModel(TestCase):
      def test(self):
          models = [TestModel0, TestModel1, TestModelA, TestModelB, TestModelC,
                   TestModelD, TestModelE, TestModelX, TestModelY, ExtendingModel]
          for model in models:
              self.assertTrue(is_instance_of_model(model))
          self.assertFalse(is_instance_of_model(NotExtendingModel))
          def not_extending_model_function():
              pass
          
          self.assertFalse(is_instance_of_model(not_extending_model_function))
  
  
  
  
subject: Test Cases for is instance of Model function