commit 0846e5d4603434c2bbf8a528677cf1ff3fe29b95
author Bar Harel <bzvi7919@gmail.com> Mon Dec 23 20:31:00 2019 +0200
committer Ivan Levkivskyi <levkivskyi@gmail.com> Mon Dec 23 18:31:00 2019 +0000
tree f44bd35fa8bc5c58ed22085a8d5a31c9172dacaf
parent 7eb8c6d2c89a8a7ba3af4a99ab20456dff544881

[3.8] bpo-38878: Fix os.PathLike __subclasshook__ (GH-17336) (GH-17684)

https://bugs.python.org/issue38878

Lib/test/test_os.py

diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 4a076e3..11454b2 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -4017,6 +4017,14 @@
         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))
+
 
 class TimesTests(unittest.TestCase):
     def test_times(self):