old_contents: """
  .. module::  django_core_models_libs.test_utils
     :synopsis:  django_core_models test utilities  module.
  
  django_core_models test utilities  module.
  
  """
  from django_core_utils.tests.api_test_utils import NamdedModelApiTestCase
  
  
  class IsoApiTestCase(NamdedModelApiTestCase):
      """Base class for named classes with iso field unit tests.
      """
      def post_required_data(self, user=None, site=None):
          """Return named model post request required data."""
          data = super(IsoApiTestCase, self).post_required_data(user, site)
          data.update(dict(iso_code=self.iso_code))
          return data
  
      def verify_create(self, url, data, model_class,
                        expected_name, expected_iso_code):
          """Verify post request for named model instance creation."""
          response, instance = super(
              IsoApiTestCase, self).verify_create(url, data,
                                                  model_class, expected_name)
          self.assertEqual(instance.iso_code, expected_iso_code)
          return response, instance
  
      def verify_create_defaults(self, data=None):
          """Verify post request will all required arguments.
  
          Pulls the required parameters from the test class.
          """
          data = data or self.post_required_data()
          return self.verify_create(
              url=self.url_list,
              data=data,
              model_class=self.model_class,
              expected_name=self.name,
              expected_iso_code=self.iso_code)
  
      def verify_create_defaults_partial(self):
          """Verify post request with partial required arguments.
  
          Pulls the required parameters from the test class.
          """
          return self.verify_create_defaults(
              data=dict(name=self.name, iso_code=self.iso_code))
new_contents: """
  .. module::  django_core_models_libs.test_utils
     :synopsis:  django_core_models test utilities  module.
  
  django_core_models test utilities  module.
  
  """
  from django_core_utils.tests.api_test_utils import NamdedModelApiTestCase
  
  
  class IsoApiTestCase(NamdedModelApiTestCase):
      """Base class for named classes with iso field unit tests.
      """
      def post_required_data(self, user=None, site=None):
          """Return named model post request required data."""
          data = super(IsoApiTestCase, self).post_required_data(user, site)
          data.update(dict(iso_code=self.iso_code))
          return data
  
      def verify_create(self, url, data, model_class,
                        expected_name, expected_iso_code):
          """Verify post request for named model instance creation."""
          response, instance = super(
              IsoApiTestCase, self).verify_create(url, data,
                                                  model_class, expected_name)
          self.assertEqual(instance.iso_code, expected_iso_code)
          return response, instance
  
      def verify_create_defaults(self, data=None):
          """Verify post request will all required arguments.
  
          Pulls the required parameters from the test class.
          """
          data = data or self.post_required_data()
          return self.verify_create(
              url=self.url_list,
              data=data,
              model_class=self.model_class,
              expected_name=self.name,
              expected_iso_code=self.iso_code)
  
      def verify_create_defaults_partial(self):
          """Verify post request with partial required arguments.
  
          Pulls the required parameters from the test class.
          """
          return self.verify_create_defaults(
              data=dict(name=self.name, iso_code=self.iso_code))
  
subject: correct flake8 issues