1 files changed, 28 insertions, 0 deletions
diff --git a/Lib/test/test_list.py b/Lib/test/test_list.py
index 3c8d829..d3da05b 100644
--- a/Lib/test/test_list.py
+++ b/Lib/test/test_list.py
@@ -46,6 +46,34 @@ class ListTest(list_tests.CommonTest):
         with self.assertRaisesRegex(TypeError, 'keyword argument'):
             list(sequence=[])
 
+    def test_keywords_in_subclass(self):
+        class subclass(list):
+            pass
+        u = subclass([1, 2])
+        self.assertIs(type(u), subclass)
+        self.assertEqual(list(u), [1, 2])
+        with self.assertRaises(TypeError):
+            subclass(sequence=())
+
+        class subclass_with_init(list):
+            def __init__(self, seq, newarg=None):
+                super().__init__(seq)
+                self.newarg = newarg
+        u = subclass_with_init([1, 2], newarg=3)
+        self.assertIs(type(u), subclass_with_init)
+        self.assertEqual(list(u), [1, 2])
+        self.assertEqual(u.newarg, 3)
+
+        class subclass_with_new(list):
+            def __new__(cls, seq, newarg=None):
+                self = super().__new__(cls, seq)
+                self.newarg = newarg
+                return self
+        u = subclass_with_new([1, 2], newarg=3)
+        self.assertIs(type(u), subclass_with_new)
+        self.assertEqual(list(u), [1, 2])
+        self.assertEqual(u.newarg, 3)
+
     def test_truth(self):
         super().test_truth()
         self.assertTrue(not [])