bpo-38932: Mock fully resets child objects on reset_mock(). (GH-17409)

2 files changed, 14 insertions, 2 deletions

diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index a97542a..beed717 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -592,7 +592,7 @@ class NonCallableMock(Base):
         for child in self._mock_children.values():
             if isinstance(child, _SpecState) or child is _deleted:
                 continue
-            child.reset_mock(visited)
+            child.reset_mock(visited, return_value=return_value, side_effect=side_effect)
 
         ret = self._mock_return_value
         if _is_instance_mock(ret) and ret is not self:
diff --git a/Lib/unittest/test/testmock/testmock.py b/Lib/unittest/test/testmock/testmock.py
index 1030d12..1329346 100644
--- a/Lib/unittest/test/testmock/testmock.py
+++ b/Lib/unittest/test/testmock/testmock.py
@@ -1636,11 +1636,23 @@ class MockTest(unittest.TestCase):
         self.assertNotEqual(m.side_effect, None)
 
     def test_reset_sideeffect(self):
-        m = Mock(return_value=10, side_effect=[2,3])
+        m = Mock(return_value=10, side_effect=[2, 3])
         m.reset_mock(side_effect=True)
         self.assertEqual(m.return_value, 10)
         self.assertEqual(m.side_effect, None)
 
+    def test_reset_return_with_children(self):
+        m = MagicMock(f=MagicMock(return_value=1))
+        self.assertEqual(m.f(), 1)
+        m.reset_mock(return_value=True)
+        self.assertNotEqual(m.f(), 1)
+
+    def test_reset_return_with_children_side_effect(self):
+        m = MagicMock(f=MagicMock(side_effect=[2, 3]))
+        self.assertNotEqual(m.f.side_effect, None)
+        m.reset_mock(side_effect=True)
+        self.assertEqual(m.f.side_effect, None)
+
     def test_mock_add_spec(self):
         class _One(object):
             one = 1