Fix Django master support.

- Explicitly encode PUT data as multipart, as Django 1.5 no longer does so by default in the test client

djangorestframework/tests/request.py

@@ -4,6 +4,7 @@ Tests for content parsing, and form-overloaded content parsing.
 from django.conf.urls.defaults import patterns
 from django.contrib.auth.models import User
 from django.test import TestCase, Client
+from django.test.client import MULTIPART_CONTENT, BOUNDARY, encode_multipart
 
 from djangorestframework import status
 from djangorestframework.authentication import SessionAuthentication
@@ -94,7 +95,8 @@ class TestContentParsing(TestCase):
         """
         data = {'qwerty': 'uiop'}
         parsers = (FormParser, MultiPartParser)
-        request = factory.put('/', data, parsers=parsers)
+        request = factory.put('/', encode_multipart(BOUNDARY, data), parsers=parsers,
+                              content_type=MULTIPART_CONTENT)
         self.assertEqual(request.DATA.items(), data.items())
 
     def test_standard_behaviour_determines_non_form_content_PUT(self):