GH-128520: pathlib ABCs: allow tests to be run externally (#131315)

Adjust the tests for the `pathlib.types` module so that they can be run
against the `pathlib-abc` PyPI package, which is a backport of the module
for older Python versions.

Specifically, we add a `.support.is_pypi` switch that is false in the
stdlib and true in the pathlib-abc package. This controls which package
we import, and whether or not we run tests against `PurePath` and `Path`.

For compatibility with older Python versions, we stop using
`zipfile.ZipFile.mkdir()` and `zipfile.ZipInfo._for_archive()`.

1 files changed, 10 insertions, 10 deletions

diff --git a/Lib/test/test_pathlib/test_join_windows.py b/Lib/test/test_pathlib/test_join_windows.py
index 783248d1697..2cc634f25ef 100644
--- a/Lib/test/test_pathlib/test_join_windows.py
+++ b/Lib/test/test_pathlib/test_join_windows.py
@@ -5,8 +5,8 @@ Tests for Windows-flavoured pathlib.types._JoinablePath
 import os
 import unittest
 
-from pathlib import PureWindowsPath, WindowsPath
-from test.test_pathlib.support.lexical_path import LexicalWindowsPath
+from .support import is_pypi
+from .support.lexical_path import LexicalWindowsPath
 
 
 class JoinTestBase:
@@ -40,8 +40,6 @@ class JoinTestBase:
         pp = p.joinpath('E:d:s')
         self.assertEqual(pp, P('E:d:s'))
         # Joining onto a UNC path with no root
-        pp = P('//').joinpath('server')
-        self.assertEqual(pp, P('//server'))
         pp = P('//server').joinpath('share')
         self.assertEqual(pp, P(r'//server\share'))
         pp = P('//./BootPartition').joinpath('Windows')
@@ -54,7 +52,7 @@ class JoinTestBase:
         self.assertEqual(p / 'x/y', P(r'C:/a/b\x/y'))
         self.assertEqual(p / 'x' / 'y', P(r'C:/a/b\x\y'))
         self.assertEqual(p / '/x/y', P('C:/x/y'))
-        self.assertEqual(p / '/x' / 'y', P('C:/x\y'))
+        self.assertEqual(p / '/x' / 'y', P(r'C:/x\y'))
         # Joining with a different drive => the first path is ignored, even
         # if the second path is relative.
         self.assertEqual(p / 'D:x/y', P('D:x/y'))
@@ -277,13 +275,15 @@ class LexicalWindowsPathJoinTest(JoinTestBase, unittest.TestCase):
     cls = LexicalWindowsPath
 
 
-class PureWindowsPathJoinTest(JoinTestBase, unittest.TestCase):
-    cls = PureWindowsPath
+if not is_pypi:
+    from pathlib import PureWindowsPath, WindowsPath
 
+    class PureWindowsPathJoinTest(JoinTestBase, unittest.TestCase):
+        cls = PureWindowsPath
 
-if os.name == 'nt':
-    class WindowsPathJoinTest(JoinTestBase, unittest.TestCase):
-        cls = WindowsPath
+    if os.name == 'nt':
+        class WindowsPathJoinTest(JoinTestBase, unittest.TestCase):
+            cls = WindowsPath
 
 
 if __name__ == "__main__":