Set maxDiff to None to see failure reason

Author: markshannon

Lib/test/test_ordered_dict.py

@@ -31,6 +31,8 @@ def replaced_module(name, replacement):
 
 class OrderedDictTests:
 
+    maxDiff = None
+
     def test_init(self):
         OrderedDict = self.OrderedDict
         with self.assertRaises(TypeError):