[1.3.X] Fixed #15876 - Document that test.client.RequestFactory doesn't support sessions or request-altering middleware; thanks slinkp for the suggestion, ShawnMilo for the patch.

Backport of r16128 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@16129 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/testing.txt

@@ -1060,6 +1060,10 @@ restricted subset of the test client API:
       ``follows``. Since this is just a factory for producing
       requests, it's up to you to handle the response.
 
+    * It does not support middleware. Session and authentication
+      attributes must be supplied by the test itself if required
+      for the view to function properly.
+
 Example
 ~~~~~~~