diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index a7631f92e7ea81..d7ba58847a2992 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -2138,6 +2138,24 @@ def test_bool_notimplemented(self):
with self.assertRaisesRegex(TypeError, msg):
not NotImplemented
+ def test_singleton_attribute_access(self):
+ for singleton in (NotImplemented, Ellipsis):
+ with self.subTest(singleton):
+ self.assertIs(type(singleton), singleton.__class__)
+ self.assertIs(type(singleton).__class__, type)
+
+ # Missing instance attributes:
+ with self.assertRaises(AttributeError):
+ singleton.prop = 1
+ with self.assertRaises(AttributeError):
+ singleton.prop
+
+ # Missing class attributes:
+ with self.assertRaises(TypeError):
+ type(singleton).prop = 1
+ with self.assertRaises(AttributeError):
+ type(singleton).prop
+
class TestBreakpoint(unittest.TestCase):
def setUp(self):
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