From 145bf269df3530176f6ebeab1324890ef7070bf8 Mon Sep 17 00:00:00 2001
From: Brandt Bucher <brandtbucher@gmail.com>
Date: Fri, 26 Feb 2021 14:51:55 -0800
Subject: bpo-42128: Structural Pattern Matching (PEP 634) (GH-22917)

Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Talin <viridia@gmail.com>
Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
---
 Lib/test/test_dataclasses.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'Lib/test/test_dataclasses.py')

diff --git a/Lib/test/test_dataclasses.py b/Lib/test/test_dataclasses.py
index 8887eb6461b..0bfed41b369 100644
--- a/Lib/test/test_dataclasses.py
+++ b/Lib/test/test_dataclasses.py
@@ -3375,5 +3375,21 @@ class TestAbstract(unittest.TestCase):
         self.assertRaisesRegex(TypeError, msg, Date)
 
 
+class TestMatchArgs(unittest.TestCase):
+    def test_match_args(self):
+        @dataclass
+        class C:
+            a: int
+        self.assertEqual(C(42).__match_args__, ('a',))
+
+    def test_explicit_match_args(self):
+        ma = []
+        @dataclass
+        class C:
+            a: int
+            __match_args__ = ma
+        self.assertIs(C(42).__match_args__, ma)
+
+
 if __name__ == '__main__':
     unittest.main()
-- 
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