diff --git a/Lib/test/test_genericpath.py b/Lib/test/test_genericpath.py
--- a/Lib/test/test_genericpath.py
+++ b/Lib/test/test_genericpath.py
@@ -267,16 +267,25 @@ class GenericTest:
 
 
 class TestGenericTest(GenericTest, unittest.TestCase):
 # Issue 16852: GenericTest can't inherit from unittest.TestCase
 # for test discovery purposes; CommonTest inherits from GenericTest
 # and is only meant to be inherited by others.
 pathmodule = genericpath
 
+ def test_null_bytes(self):
+ for attr in GenericTest.common_attributes:
+ # os.path.commonprefix doesn't raise ValueError
+ if attr == 'commonprefix':
+ continue
+ with self.subTest(attr=attr):
+ with self.assertRaises(ValueError) as cm:
+ getattr(self.pathmodule, attr)('/tmp\x00abcds')
+ self.assertEqual(str(cm.exception), 'embedded null byte')
 
 # Following TestCase is not supposed to be run from test_genericpath.
 # It is inherited by other test modules (macpath, ntpath, posixpath).
 
 class CommonTest(GenericTest):
 common_attributes = GenericTest.common_attributes + [
 # Properties
 'curdir', 'pardir', 'extsep', 'sep',
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