1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index f44ddba..82c441c 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -4048,6 +4048,14 @@ class TestPEP519(unittest.TestCase):
         self.assertRaises(ZeroDivisionError, self.fspath,
                           FakePath(ZeroDivisionError()))
 
+    def test_pathlike_subclasshook(self):
+        # bpo-38878: subclasshook causes subclass checks
+        # true on abstract implementation.
+        class A(os.PathLike):
+            pass
+        self.assertFalse(issubclass(FakePath, A))
+        self.assertTrue(issubclass(FakePath, os.PathLike))
+
     def test_pathlike_class_getitem(self):
         self.assertIs(os.PathLike[bytes], os.PathLike)