pythongh-103724: Add test case if no arg as provided in os.register_a…

…t_fork (pythongh-103725)
vstinner · Apr 23, 2023 · 7255bbd · 7255bbd
1 parent 82932b7
commit 7255bbd
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
@@ -231,6 +231,9 @@ def test_register_at_fork(self):
         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='')