diff --git a/Lib/test/test_unittest/testmock/testmock.py b/Lib/test/test_unittest/testmock/testmock.py
index d1cae47a40eed4..9a80fbb9acc678 100644
--- a/Lib/test/test_unittest/testmock/testmock.py
+++ b/Lib/test/test_unittest/testmock/testmock.py
@@ -234,6 +234,14 @@ class B(object):
             with mock.patch('builtins.open', mock.mock_open()):
                 mock.mock_open()  # should still be valid with open() mocked
 
+    def test_explicit_parent(self):
+        parent = Mock()
+        mock1 = Mock(parent=parent, return_value=None)
+        mock1(1, 2, 3)
+        mock2 = Mock(parent=parent, return_value=None)
+        mock2(4, 5, 6)
+
+        self.assertEqual(parent.mock_calls, [call(1, 2, 3), call(4, 5, 6)])
 
     def test_reset_mock(self):
         parent = Mock()