content: from circuits.models import Circuit, Provider
  from utilities.prefetch import get_prefetchable_fields
  from utilities.testing.base import TestCase
  
  
  class GetPrefetchableFieldsTest(TestCase):
      """
      Verify the operation of get_prefetchable_fields()
      """
      def test_get_prefetchable_fields(self):
          field_names = get_prefetchable_fields(Provider)
          self.assertIn('asns', field_names)  # ManyToManyField
          self.assertIn('circuits', field_names)  # Reverse relation
          self.assertIn('tags', field_names)  # Tags
  
          field_names = get_prefetchable_fields(Circuit)
          self.assertIn('group_assignments', field_names)  # Generic relation
  