old_contents: from django.db import models
  from enumfields import Enum, EnumField
  
  
  class MyModel(models.Model):
  
      class Color(Enum):
          RED = 'r'
          GREEN = 'g'
          BLUE = 'b'
  
      color = EnumField(Color, max_length=1)
  
new_contents: from django.db import models
  from enum import Enum
  from enumfields import EnumField
  
  
  class MyModel(models.Model):
  
      class Color(Enum):
          RED = 'r'
          GREEN = 'g'
          BLUE = 'b'
  
      color = EnumField(Color, max_length=1)
  
subject: Use regular Enums in tests