From a6738cdedecfce7404565902b6247f34e0f7077d Mon Sep 17 00:00:00 2001
From: roselyn <roselyn@thoughtmachine.net>
Date: Wed, 11 Nov 2026 12:13:21 +0000
Subject: [PATCH] Allow unittest.assertIsNone() and unittest.AssertIsNotNone()
 to narrow types

---
 stdlib/unittest/case.pyi | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/stdlib/unittest/case.pyi b/stdlib/unittest/case.pyi
index 1d1206b7fc36..7c8b77f39b79 100644
--- a/stdlib/unittest/case.pyi
+++ b/stdlib/unittest/case.pyi
@@ -102,8 +102,17 @@ class TestCase:
     def assertFalse(self, expr: Any, msg: Any = None) -> None: ...
     def assertIs(self, expr1: object, expr2: object, msg: Any = None) -> None: ...
     def assertIsNot(self, expr1: object, expr2: object, msg: Any = None) -> None: ...
-    def assertIsNone(self, obj: object, msg: Any = None) -> None: ...
+
+    @overload
+    def assertIsNone(self, obj: None, msg: Any = None) -> None: ...
+    @overload
+    def assertIsNone(self, obj: object, msg: Any = None) -> Never: ...
+
+    @overload
+    def assertIsNotNone(self, obj: None, msg: Any = None) -> Never: ...
+    @overload
     def assertIsNotNone(self, obj: object, msg: Any = None) -> None: ...
+
     def assertIn(self, member: Any, container: Iterable[Any] | Container[Any], msg: Any = None) -> None: ...
     def assertNotIn(self, member: Any, container: Iterable[Any] | Container[Any], msg: Any = None) -> None: ...
     def assertIsInstance(self, obj: object, cls: _ClassInfo, msg: Any = None) -> None: ...