1 files changed, 10 insertions, 0 deletions
diff --git a/Lib/test/test_types.py b/Lib/test/test_types.py
index f499fb9..52a59d5 100644
--- a/Lib/test/test_types.py
+++ b/Lib/test/test_types.py
@@ -713,6 +713,16 @@ class TypesTests(unittest.TestCase):
         assert repr(int | None) == "int | None"
         assert repr(int | typing.GenericAlias(list, int)) == "int | list[int]"
 
+    def test_ellipsis_type(self):
+        self.assertIsInstance(Ellipsis, types.EllipsisType)
+
+    def test_notimplemented_type(self):
+        self.assertIsInstance(NotImplemented, types.NotImplementedType)
+
+    def test_none_type(self):
+        self.assertIsInstance(None, types.NoneType)
+
+
 class MappingProxyTests(unittest.TestCase):
     mappingproxy = types.MappingProxyType