[1.2.X] Fixed errors introduced in r14280 when running Django tests under Python < 2.6.

Backport of [14287] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14289 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/queries/tests.py

@@ -1430,7 +1430,8 @@ class CloneTests(TestCase):
 
 class EmptyQuerySetTests(TestCase):
     def test_emptyqueryset_values(self):
-        "#14366 -- calling .values() on an EmptyQuerySet and then cloning that should not cause an error"
+        # #14366 -- calling .values() on an EmptyQuerySet and then cloning that
+        # should not cause an error
         self.assertEqual(list(Number.objects.none().values('num').order_by('num')), [])
 
     def test_values_subquery(self):
@@ -1483,11 +1484,19 @@ class EscapingTests(TestCase):
 # the way Python handles list() calls internally. Thus, we skip the tests for
 # Python 2.6.
 if sys.version_info[:2] != (2, 6):
-    class OrderingLoopTests(TestCase):
+    class OrderingLoopTests(BaseQuerysetTest):
+        def setUp(self):
+            generic = NamedCategory.objects.create(name="Generic")
+            t1 = Tag.objects.create(name='t1', category=generic)
+            t2 = Tag.objects.create(name='t2', parent=t1, category=generic)
+            t3 = Tag.objects.create(name='t3', parent=t1)
+            t4 = Tag.objects.create(name='t4', parent=t3)
+            t5 = Tag.objects.create(name='t5', parent=t3)
+
         def test_infinite_loop(self):
             # If you're not careful, it's possible to introduce infinite loops via
             # default ordering on foreign keys in a cycle. We detect that.
-            self.assertRaises(
+            self.assertRaisesMessage(
                 FieldError,
                 'Infinite loop caused by ordering.',
                 LoopX.objects.all