[3.15] Test that `ValueError` is raised when `vfsopen` is passed an invalid mode (GH-154008) (#154064)

https://github.com/python/cpython/commit/003764f671893bb7d3233ffde3f140032ba3f79d
commit: 003764f671893bb7d3233ffde3f140032ba3f79d
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: tomasr8 <[email protected]>
date: 2026-07-19T09:10:16Z
summary:

[3.15] Test that `ValueError` is raised when `vfsopen` is passed an invalid mode (GH-154008) (#154064)

Test that `ValueError` is raised when `vfsopen` is passed an invalid mode (GH-154008)

* ValueError with message test

* Remove white space

* Apply suggestions from code review

Change from double quotes to single quotes.



---------
(cherry picked from commit 9f5af278960a2f73a2e070de5141701e72675cf6)

Co-authored-by: Rayan <[email protected]>
Co-authored-by: Tomas R. <[email protected]>

files:
M Lib/test/test_pathlib/test_read.py

diff --git a/Lib/test/test_pathlib/test_read.py b/Lib/test/test_pathlib/test_read.py
index 16fb555b2aee05..51eede9d9ebafb 100644
--- a/Lib/test/test_pathlib/test_read.py
+++ b/Lib/test/test_pathlib/test_read.py
@@ -329,6 +329,11 @@ def test_info_is_symlink(self):
         self.assertFalse((p / 'fileA\udfff').info.is_symlink())
         self.assertFalse((p / 'fileA\x00').info.is_symlink())
 
+    def test_invalid_mode(self):
+        p = self.root / 'fileA'
+        with self.assertRaisesRegex(ValueError, 'invalid mode'):
+            vfsopen(p, 'q')
+
 
 class ZipPathReadTest(ReadTestBase, unittest.TestCase):
     ground = ZipPathGround(ReadableZipPath)

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