unittest.mock: a mock created by patch with a spec as the list argument will be callable if __call__ is in the spec

Lib/unittest/mock.py

@@ -1166,7 +1166,14 @@ class _patch(object):
             if new_callable is not None:
                 Klass = new_callable
             elif spec is not None or spec_set is not None:
-                if not _callable(spec or spec_set):
+                this_spec = spec
+                if spec_set is not None:
+                    this_spec = spec_set
+                if _is_list(this_spec):
+                    not_callable = '__call__' not in this_spec
+                else:
+                    not_callable = not callable(this_spec)
+                if not_callable:
                     Klass = NonCallableMagicMock
 
             if spec is not None:

Lib/unittest/test/testmock/testpatch.py

@@ -1742,6 +1742,26 @@ class PatchTest(unittest.TestCase):
                 p.stop()
 
 
+    def test_callable_spec_as_list(self):
+        spec = ('__call__',)
+        p = patch(MODNAME, spec=spec)
+        m = p.start()
+        try:
+            self.assertTrue(callable(m))
+        finally:
+            p.stop()
+
+
+    def test_not_callable_spec_as_list(self):
+        spec = ('foo', 'bar')
+        p = patch(MODNAME, spec=spec)
+        m = p.start()
+        try:
+            self.assertFalse(callable(m))
+        finally:
+            p.stop()
+
+
 
 if __name__ == '__main__':
     unittest.main()