  from django.test import TestCase
  from rest_framework import serializers
  from rest_framework.tests.models import (HasPositiveIntegerAsChoice, Album, ActionItem, Anchor, BasicModel,
      BlankFieldModel, BlogPost, BlogPostComment, Book, CallableDefaultValueModel, DefaultValueModel,
      ManyToManyModel, Person, ReadOnlyManyToManyModel, Photo, SeveralChoicesModel)
  import datetime
  import pickle
  
  
  class SubComment(object):
 
</s> remove # Model for issue #725
class SeveralChoicesModel(RESTFrameworkModel):
    color = models.CharField(
        max_length=10,
        choices=[('red', 'Red'), ('green', 'Green'), ('blue', 'Blue')],
        blank=False
    )
    drink = models.CharField(
        max_length=10,
        choices=[('beer', 'Beer'), ('wine', 'Wine'), ('cider', 'Cider')],
        blank=False,
        default='beer'
    )
    os = models.CharField(
        max_length=10,
        choices=[('linux', 'Linux'), ('osx', 'OSX'), ('windows', 'Windows')],
        blank=True
    )
    music_genre = models.CharField(
        max_length=10,
        choices=[('rock', 'Rock'), ('metal', 'Metal'), ('grunge', 'Grunge')],
        blank=True,
        default='metal'
    )


 </s> add 
    ManyToManyModel, Person, ReadOnlyManyToManyModel, Photo)
  from django.test import TestCase
  from rest_framework import serializers
  from rest_framework.tests.models import (HasPositiveIntegerAsChoice, Album, ActionItem, Anchor, BasicModel,
      BlankFieldModel, BlogPost, BlogPostComment, Book, CallableDefaultValueModel, DefaultValueModel,
    ManyToManyModel, Person, ReadOnlyManyToManyModel, Photo)
  import datetime
  import pickle
  
  
  class SubComment(object):
keep keep keep keep replace keep keep keep keep keep
 Moved test model into closer to the testcase 
rest_framework/tests/serializer.py