From 7255bbd4a1841447a21c3eb74e4fd9e21818d833 Mon Sep 17 00:00:00 2001
From: Ankit Kumar Pandey <93041495+itsankitkp@users.noreply.github.com>
Date: Mon, 24 Apr 2023 04:44:14 +0530
Subject: gh-103724: Add test case if no arg as provided in os.register_at_fork
 (gh-103725)

---
 Lib/test/test_posix.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 77f42f7f9c..444f8abe46 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -231,6 +231,9 @@ class PosixTester(unittest.TestCase):
         with self.assertRaises(TypeError, msg="Invalid arg was allowed"):
             # Ensure a combination of valid and invalid is an error.
             os.register_at_fork(before=None, after_in_parent=lambda: 3)
+        with self.assertRaises(TypeError, msg="At least one argument is required"):
+            # when no arg is passed
+            os.register_at_fork()
         with self.assertRaises(TypeError, msg="Invalid arg was allowed"):
             # Ensure a combination of valid and invalid is an error.
             os.register_at_fork(before=lambda: None, after_in_child='')
-- 
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