diff -r f8dbec87dbfe Lib/unittest/mock.py
--- a/Lib/unittest/mock.py	Tue Mar 18 07:44:07 2014 +0100
+++ b/Lib/unittest/mock.py	Wed Mar 19 13:54:58 2014 +0100
@@ -1634,7 +1634,9 @@
     "bool next "
 )
 
-numerics = "add sub mul div floordiv mod lshift rshift and xor or pow "
+numerics = (
+    "add sub mul div floordiv mod lshift rshift and xor or pow truediv"
+)
 inplace = ' '.join('i%s' % n for n in numerics.split())
 right = ' '.join('r%s' % n for n in numerics.split())
 
diff -r f8dbec87dbfe Lib/unittest/test/testmock/testmagicmethods.py
--- a/Lib/unittest/test/testmock/testmagicmethods.py	Tue Mar 18 07:44:07 2014 +0100
+++ b/Lib/unittest/test/testmock/testmagicmethods.py	Wed Mar 19 13:54:58 2014 +0100
@@ -126,6 +126,31 @@
         self.assertEqual(7 + mock, mock)
         self.assertEqual(mock.value, 16)
 
+    def test_division(self):
+        original = mock = Mock()
+        mock.value = 32
+        self.assertRaises(TypeError, lambda: mock / 2)
+
+        def truediv(self, other):
+            mock.value /= other
+            return self
+        mock.__truediv__ = truediv
+        self.assertEqual(mock / 2, mock)
+        self.assertEqual(mock.value, 16)
+
+        del mock.__truediv__
+        def itruediv(mock):
+            mock /= 4
+        self.assertRaises(TypeError, itruediv, mock)
+        mock.__itruediv__ = truediv
+        mock /= 8
+        self.assertEqual(mock, original)
+        self.assertEqual(mock.value, 2)
+
+        self.assertRaises(TypeError, lambda: 8 / mock)
+        mock.__rtruediv__ = truediv
+        self.assertEqual(0.5 / mock, mock)
+        self.assertEqual(mock.value, 4)
 
     def test_hash(self):
         mock = Mock()