gh-155503: Check Py_TPFLAGS_IMMUTABLETYPE in check_immutable_type() (#155620)

https://github.com/python/cpython/commit/76f2903865e39e85b6c152114d9522d99969c09d
commit: 76f2903865e39e85b6c152114d9522d99969c09d
branch: main
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-08-13T12:30:01+02:00
summary:

gh-155503: Check Py_TPFLAGS_IMMUTABLETYPE in check_immutable_type() (#155620)

Check for the Py_TPFLAGS_IMMUTABLETYPE type flag in
test.support.check_immutable_type().

files:
M Lib/test/support/__init__.py

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index f98da49171dc3b5..3f2caebd21e336c 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -3484,3 +3484,11 @@ def check_immutable_type(testcase, type):
     regex = r'cannot set .* attribute of immutable type'
     with testcase.assertRaisesRegex(TypeError, regex):
         setattr(type, 'custom_attr', 123)
+
+    try:
+        from _testlimitedcapi import type_getflags, Py_TPFLAGS_IMMUTABLETYPE
+    except ImportError:
+        pass
+    else:
+        flags = type_getflags(type)
+        testcase.assertTrue(flags & Py_TPFLAGS_IMMUTABLETYPE)

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