old_contents: # MIT License
  # Copyright (c) 2017 MassChallenge, Inc.
  
  from django.test.runner import DiscoverRunner
  
  
  class UnManagedModelTestRunner(DiscoverRunner):
      '''
      Test runner that automatically makes all unmanaged models in your Django
      project managed for the duration of the test run.
      Many thanks to the Caktus Group: http://bit.ly/1N8TcHW
      '''
  
      def setup_test_environment(self, *args, **kwargs):
          from django.apps import apps
          self.unmanaged_models = [
              m for m in apps.get_models() if not m._meta.managed]
          for m in self.unmanaged_models:
              m._meta.managed = True
          super(
              UnManagedModelTestRunner,
              self).setup_test_environment(*args, **kwargs)
  
  
  
      def teardown_test_environment(self, *args, **kwargs):
          super(
              UnManagedModelTestRunner,
              self).teardown_test_environment(*args, **kwargs)
          # reset unmanaged models
          for m in self.unmanaged_models:
              m._meta.managed = False
  
new_contents: # MIT License
  # Copyright (c) 2017 MassChallenge, Inc.
  
  from django.test.runner import DiscoverRunner
  
  
  class UnManagedModelTestRunner(DiscoverRunner):
      '''
      Test runner that automatically makes all unmanaged models in your Django
      project managed for the duration of the test run.
      Many thanks to the Caktus Group: http://bit.ly/1N8TcHW
      '''
  
      def setup_test_environment(self, *args, **kwargs):
          from django.apps import apps
          self.unmanaged_models = [
              m for m in apps.get_models() if not m._meta.managed]
          for m in self.unmanaged_models:
              m._meta.managed = True
          super(
              UnManagedModelTestRunner,
              self).setup_test_environment(*args, **kwargs)
  
      def teardown_test_environment(self, *args, **kwargs):
          super(
              UnManagedModelTestRunner,
              self).teardown_test_environment(*args, **kwargs)
          # reset unmanaged models
          for m in self.unmanaged_models:
              m._meta.managed = False
  
subject: fix fpdiff issue.