issue27186: add PathLike ABC
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index bf06438..e740edf 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -3127,6 +3127,8 @@
                 return '#feelthegil'
 
         self.assertEqual('#feelthegil', os.fspath(PathLike()))
+        self.assertTrue(issubclass(PathLike, os.PathLike))
+        self.assertTrue(isinstance(PathLike(), os.PathLike))
 
     def test_garbage_in_exception_out(self):
         vapor = type('blah', (), {})