Add tests case

Author: colesbury

Lib/test/test_pathlib/test_pathlib.py

@@ -11,6 +11,7 @@
 import socket
 import stat
 import tempfile
+import threading
 import unittest
 from unittest import mock
 from urllib.request import pathname2url
@@ -20,6 +21,7 @@
 from test.support import is_emscripten, is_wasi, is_wasm32
 from test.support import infinite_recursion
 from test.support import os_helper
+from test.support import threading_helper
 from test.support.os_helper import TESTFN, FS_NONASCII, FakePath
 try:
     import fcntl
@@ -1098,6 +1100,27 @@ def test_is_relative_to_windows(self):
         self.assertFalse(p.is_relative_to(P('//z/Share/Foo')))
         self.assertFalse(p.is_relative_to(P('//Server/z/Foo')))
 
+    @threading_helper.requires_working_threading()
+    def test_raw_path_multithread(self):
+        P = self.cls
+        sep = self.sep
+
+        NUM_THREADS = 10
+        NUM_ITERS = 10
+
+        for _ in range(NUM_ITERS):
+            b = threading.Barrier(NUM_THREADS)
+            path = P('a') / 'b' / 'c' / 'd' / 'e'
+            expected = sep.join(['a', 'b', 'c', 'd', 'e'])
+
+            def check_raw_path():
+                b.wait()
+                self.assertEqual(path._raw_path, expected)
+
+            threads = [threading.Thread(target=check_raw_path) for _ in range(NUM_THREADS)]
+            with threading_helper.start_threads(threads):
+                pass
+
 
 class PurePosixPathTest(PurePathTest):
     cls = pathlib.PurePosixPath