diff -r 374f501f4567 Lib/unittest/test/testmock/testmock.py
--- a/Lib/unittest/test/testmock/testmock.py	Sat Sep 12 17:36:44 2015 +0100
+++ b/Lib/unittest/test/testmock/testmock.py	Sun Feb 07 22:01:06 2016 +0000
@@ -316,6 +316,12 @@
         mock.assert_called_with(1, 2, 3, a='fish', b='nothing')
 
 
+    def test_assert_called_with_any(self):
+        m = MagicMock()
+        m(MagicMock())
+        m.assert_called_with(mock.ANY)
+
+
     def test_assert_called_with_function_spec(self):
         def f(a, b, c, d=None):
             pass