GH-110109: Simplify pathlib test setup

[barneygale]

Use the class under test to create files, directories and symlinks.

• Issue: User-defined virtual path objects #110109

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Debian PGO 3.x has failed when building commit da0a68a.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/249/builds/6613) and take a look at the build logs.
4. Check if the failure is related to this commit (da0a68a) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/249/builds/6613

Failed tests:

• test.test_concurrent_futures.test_shutdown

Summary of the results of the build (if available):

==

Click to see traceback logs

remote: Enumerating objects: 9, done.        
remote: Counting objects:  11% (1/9)        
remote: Counting objects:  22% (2/9)        
remote: Counting objects:  33% (3/9)        
remote: Counting objects:  44% (4/9)        
remote: Counting objects:  55% (5/9)        
remote: Counting objects:  66% (6/9)        
remote: Counting objects:  77% (7/9)        
remote: Counting objects:  88% (8/9)        
remote: Counting objects: 100% (9/9)        
remote: Counting objects: 100% (9/9), done.        
remote: Compressing objects:  25% (1/4)        
remote: Compressing objects:  50% (2/4)        
remote: Compressing objects:  75% (3/4)        
remote: Compressing objects: 100% (4/4)        
remote: Compressing objects: 100% (4/4), done.        
remote: Total 5 (delta 4), reused 1 (delta 1), pack-reused 0        
From https://github.com/python/cpython
 * branch                  main       -> FETCH_HEAD
Note: switching to 'da0a68afc9d1487fad20c50f5133cda731d17a17'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at da0a68afc9 GH-110109: Simplify pathlib test setup (#110308)
Switched to and reset branch 'main'

find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make[2]: [Makefile:2800: clean-retain-profile] Error 1 (ignored)
./Modules/readline.c: In function ‘setup_readline’:
./Modules/readline.c:1260:21: warning: assignment to ‘int (*)(const char *, int)’ from incompatible pointer type ‘int (*)(void)’ [-Wincompatible-pointer-types]
 1260 |     rl_startup_hook = on_startup_hook;
      |                     ^
./Modules/readline.c:1262:23: warning: assignment to ‘int (*)(const char *, int)’ from incompatible pointer type ‘int (*)(void)’ [-Wincompatible-pointer-types]
 1262 |     rl_pre_input_hook = on_pre_input_hook;
      |                       ^
./Modules/socketmodule.c: In function ‘getsockaddrarg’:
./Modules/socketmodule.c:2468:9: warning: ‘strncpy’ specified bound 64 equals destination size [-Wstringop-truncation]
 2468 |         strncpy((char *)sa->salg_name, name, sizeof(sa->salg_name));
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./Modules/readline.c: In function ‘setup_readline’:
./Modules/readline.c:1260:21: warning: assignment to ‘int (*)(const char *, int)’ from incompatible pointer type ‘int (*)(void)’ [-Wincompatible-pointer-types]
 1260 |     rl_startup_hook = on_startup_hook;
      |                     ^
./Modules/readline.c:1262:23: warning: assignment to ‘int (*)(const char *, int)’ from incompatible pointer type ‘int (*)(void)’ [-Wincompatible-pointer-types]
 1262 |     rl_pre_input_hook = on_pre_input_hook;
      |                       ^
In function ‘utf8_toUtf8’,
    inlined from ‘toAscii’ at ./Modules/expat/xmltok.c:1043:3,
    inlined from ‘doParseXmlDecl’ at ./Modules/expat/xmltok.c:1197:13:
./Modules/expat/xmltok.c:390:5: warning: ‘memcpy’ writing 2 or more bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
  390 |     memcpy(*toP, *fromP, bytesToCopy);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘utf8_toUtf8’,
    inlined from ‘toAscii’ at ./Modules/expat/xmltok.c:1043:3,
    inlined from ‘parsePseudoAttribute.part.0’ at ./Modules/expat/xmltok.c:1075:9:
./Modules/expat/xmltok.c:390:5: warning: ‘memcpy’ writing 2 or more bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
  390 |     memcpy(*toP, *fromP, bytesToCopy);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘utf8_toUtf8’,
    inlined from ‘toAscii’ at ./Modules/expat/xmltok.c:1043:3,
    inlined from ‘parsePseudoAttribute.part.0’ at ./Modules/expat/xmltok.c:1081:12:
./Modules/expat/xmltok.c:390:5: warning: ‘memcpy’ writing 2 or more bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
  390 |     memcpy(*toP, *fromP, bytesToCopy);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘utf8_toUtf8’,
    inlined from ‘toAscii’ at ./Modules/expat/xmltok.c:1043:3,
    inlined from ‘parsePseudoAttribute.part.0’ at ./Modules/expat/xmltok.c:1088:9:
./Modules/expat/xmltok.c:390:5: warning: ‘memcpy’ writing 2 or more bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
  390 |     memcpy(*toP, *fromP, bytesToCopy);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./Modules/expat/xmltok.c:390:5: warning: ‘memcpy’ writing 2 or more bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
In function ‘utf8_toUtf8’,
    inlined from ‘toAscii’ at ./Modules/expat/xmltok.c:1043:3,
    inlined from ‘parsePseudoAttribute.part.0’ at ./Modules/expat/xmltok.c:1115:7:
./Modules/expat/xmltok.c:390:5: warning: ‘memcpy’ writing 2 or more bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
  390 |     memcpy(*toP, *fromP, bytesToCopy);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘utf8_toUtf8’,
    inlined from ‘toAscii’ at ./Modules/expat/xmltok.c:1043:3,
    inlined from ‘parsePseudoAttribute.part.0’ at ./Modules/expat/xmltok.c:1128:9:
./Modules/expat/xmltok.c:390:5: warning: ‘memcpy’ writing 2 or more bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
  390 |     memcpy(*toP, *fromP, bytesToCopy);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

make: *** [Makefile:2022: buildbottest] Error 5

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL8 LTO + PGO 3.x has failed when building commit da0a68a.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/442/builds/5167) and take a look at the build logs.
4. Check if the failure is related to this commit (da0a68a) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/442/builds/5167

Failed tests:

• test.test_multiprocessing_fork.test_processes

Summary of the results of the build (if available):

==

Click to see traceback logs

remote: Enumerating objects: 9, done.        
remote: Counting objects:  11% (1/9)        
remote: Counting objects:  22% (2/9)        
remote: Counting objects:  33% (3/9)        
remote: Counting objects:  44% (4/9)        
remote: Counting objects:  55% (5/9)        
remote: Counting objects:  66% (6/9)        
remote: Counting objects:  77% (7/9)        
remote: Counting objects:  88% (8/9)        
remote: Counting objects: 100% (9/9)        
remote: Counting objects: 100% (9/9), done.        
remote: Compressing objects:  25% (1/4)        
remote: Compressing objects:  50% (2/4)        
remote: Compressing objects:  75% (3/4)        
remote: Compressing objects: 100% (4/4)        
remote: Compressing objects: 100% (4/4), done.        
remote: Total 5 (delta 4), reused 2 (delta 1), pack-reused 0        
From https://github.com/python/cpython
 * branch                  main       -> FETCH_HEAD
Note: switching to 'da0a68afc9d1487fad20c50f5133cda731d17a17'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at da0a68afc9 GH-110109: Simplify pathlib test setup (#110308)
Switched to and reset branch 'main'

find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make[2]: [Makefile:2800: clean-retain-profile] Error 1 (ignored)

make: *** [Makefile:2022: buildbottest] Error 5