diff -r 69d479e9aa82 Lib/unittest/mock.py
--- a/Lib/unittest/mock.py	Tue Apr 15 22:41:36 2014 +0200
+++ b/Lib/unittest/mock.py	Wed Apr 16 22:33:58 2014 +0530
@@ -1877,7 +1877,7 @@
     formatted_args = ''
     args_string = ', '.join([repr(arg) for arg in args])
     kwargs_string = ', '.join([
-        '%s=%r' % (key, value) for key, value in kwargs.items()
+        '%s=%r' % (key, value) for key, value in sorted(kwargs.items())
     ])
     if args_string:
         formatted_args = args_string