Made the template tests error output a bit more pretty.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10191 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/templates/tests.py

@@ -229,7 +229,8 @@ class Templates(unittest.TestCase):
         settings.TEMPLATE_DEBUG = old_td
         settings.TEMPLATE_STRING_IF_INVALID = old_invalid
 
-        self.assertEqual(failures, [], ('-'*70 + '\n').join(failures))
+        self.assertEqual(failures, [], "Tests failed:\n%s\n%s" %
+            ('-'*70, ("\n%s\n" % ('-'*70)).join(failures)))
 
     def render(self, test_template, vals):
         return test_template.render(template.Context(vals[1]))