  Tests for content parsing, and form-overloaded content parsing.
  """
  from django.test import TestCase
  from djangorestframework.compat import RequestFactory
  from djangorestframework.request import RequestMixin
  from djangorestframework.parsers import FormParser, MultipartParser, PlainTextParser
  
  
  class TestContentParsing(TestCase):
      def setUp(self):
 
</s> remove from djangorestframework.request import RequestMixin
 </s> add from djangorestframework.mixins import RequestMixin </s> remove from djangorestframework.response import ResponseException
 </s> add from djangorestframework.response import ErrorResponse </s> remove from djangorestframework.emitters import EmitterMixin, BaseEmitter
 </s> add from djangorestframework.emitters import BaseEmitter
from djangorestframework.mixins import ResponseMixin </s> remove from djangorestframework.emitters import EmitterMixin
from djangorestframework.response import Response, ResponseException
from djangorestframework.request import RequestMixin, AuthMixin
 </s> add from djangorestframework.response import Response, ErrorResponse
from djangorestframework.mixins import RequestMixin, ResponseMixin, AuthMixin </s> remove from djangorestframework.response import ResponseException
 </s> add from djangorestframework.response import ErrorResponse
from djangorestframework.mixins import RequestMixin
  Tests for content parsing, and form-overloaded content parsing.
  """
  from django.test import TestCase
  from djangorestframework.compat import RequestFactory
from djangorestframework.mixins import RequestMixin
  from djangorestframework.parsers import FormParser, MultipartParser, PlainTextParser
  
  
  class TestContentParsing(TestCase):
      def setUp(self):
keep keep keep keep replace keep keep keep keep keep
 Rename mixins into Mixin class, rename ResponseException to ErrorResponse, remove NoContent 
djangorestframework/tests/content.py