python
diff --git a/‎Lib/unittest/mock.py
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+1-1Lines changed: 1 addition & 1 deletion b/‎Lib/unittest/mock.py
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+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎Lib/unittest/test/testmock/testhelpers.py
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diff --git a/‎Misc/NEWS.d/next/Library/2017-07-20-02-29-49.bpo-29403.3RinCV.rst
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@@ -155,7 +155,7 @@ def _set_signature(mock, original, instance=False):
     skipfirst = isinstance(original, type)
     result = _get_signature_object(original, instance, skipfirst)
     if result is None:
-        return
+        return mock
     func, sig = result
     def checksig(*args, **kwargs):
         sig.bind(*args, **kwargs)
 
@@ -1,3 +1,5 @@
+import time
+import types
 import unittest
 
 from unittest.mock import (
@@ -856,6 +858,19 @@ def check_data_descriptor(mock_attr):
         check_data_descriptor(foo.desc)
 
 
+    def test_autospec_on_bound_builtin_function(self):
+        meth = types.MethodType(time.ctime, time.time())
+        self.assertIsInstance(meth(), str)
+        mocked = create_autospec(meth)
+
+        # no signature, so no spec to check against
+        mocked()
+        mocked.assert_called_once_with()
+        mocked.reset_mock()
+        mocked(4, 5, 6)
+        mocked.assert_called_once_with(4, 5, 6)
+
+
 class TestCallList(unittest.TestCase):
 
     def test_args_list_contains_call_list(self):
 
@@ -0,0 +1,2 @@
+Fix ``unittest.mock``'s autospec to not fail on method-bound builtin
+functions.  Patch by Aaron Gallagher.
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix ``unittest.mock``'s autospec to not fail on method-bound builtin
	`2`	`+functions. Patch by Aaron Gallagher.`