Test 12 (util) Failing on Windows

Reproduction steps

README.md

Expected behavior

There should be no failing tests when you build an unmodified source tree from a [release](https://github.com/libgit2/libgit2/releases), or from the [main branch](https://github.com/libgit2/libgit2/tree/main). Please contact us or [open an issue](https://github.com/libgit2/libgit2/issues) if you see test failures.

Actual behavior

12: posix......
12: pqueue.....'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a07432'
12: CMD.EXE was started with the above path as the current directory.
12: UNC paths are not supported.  Defaulting to Windows directory.
12:
12: process::env.'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a07432'
12: CMD.EXE was started with the above path as the current directory.
12: UNC paths are not supported.  Defaulting to Windows directory.
12: .'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a07432'
12: CMD.EXE was started with the above path as the current directory.
12: UNC paths are not supported.  Defaulting to Windows directory.
12: .'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a07432'
12: CMD.EXE was started with the above path as the current directory.
12: UNC paths are not supported.  Defaulting to Windows directory.
12: F'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a07432'
12: CMD.EXE was started with the above path as the current directory.
12: UNC paths are not supported.  Defaulting to Windows directory.
12:
12: process::start..'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a07432'
12: CMD.EXE was started with the above path as the current directory.
12: UNC paths are not supported.  Defaulting to Windows directory.
12: ...
12: process::win32....

12: zstream....
12:
12:   1) Failure:
12: process::env::can_clear_env [D:\Apps\Fritzing Entirity\libgit2-1.8.1\tests\util\process\env.c:52]
12:   0 != result.exitcode
12:   0 != 1
12:
12/12 Test #12: util .............................***Failed    4.61 sec

92% tests passed, 1 tests failed out of 12

Total Test time (real) = 1169.06 sec

The following tests FAILED:
         12 - util (Failed)
Errors while running CTest
Output from these tests are in: D:/Apps/Fritzing Entirity/libgit2-1.8.1/build/Testing/Temporary/LastTest.log
Use "--rerun-failed --output-on-failure" to re-run the failed cases verbosely.

After rebuilding after removing space from parent directory name,

PS D:\Apps\FritzingEntirity\libgit2-1.8.1\build> ctest -R util
Test project D:/Apps/FritzingEntirity/libgit2-1.8.1/build
    Start 12: util
1/1 Test #12: util .............................***Failed    4.05 sec

0% tests passed, 1 tests failed out of 1

Total Test time (real) =   4.06 sec

The following tests FAILED:
         12 - util (Failed)
Errors while running CTest
Output from these tests are in: D:/Apps/FritzingEntirity/libgit2-1.8.1/build/Testing/Temporary/LastTest.log
Use "--rerun-failed --output-on-failure" to re-run the failed cases verbosely.

PS D:\Apps\FritzingEntirity\libgit2-1.8.1\build> ctest --rerun-failed --output-on-failure
Test project D:/Apps/FritzingEntirity/libgit2-1.8.1/build
    Start 12: util
1/1 Test #12: util .............................***Failed    4.03 sec
Loaded 54 suites:
Started (test status codes: OK='.' FAILURE='F' SKIPPED='S')

alloc....
array.
assert.....
bitvec.
copy...
dirent.........
encoding..
errors.......
filebuf............
ftruncateSS
futils...S
gitstr..........................
hex.
hostname.
iconv...
init...
integer...
link..SSSSSSSSS....SS....SSS
memmem...
mkdir......
path::core.................................
path::win32.............
pool...
posix......
pqueue.....'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a30044'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported.  Defaulting to Windows directory.

process::env.'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a30044'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported.  Defaulting to Windows directory.
.'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a30044'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported.  Defaulting to Windows directory.
.'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a30044'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported.  Defaulting to Windows directory.
F'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a30044'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported.  Defaulting to Windows directory.

process::start..'\\?\C:\Users\siddh\AppData\Local\Temp\libgit2_tests_a30044'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported.  Defaulting to Windows directory.
...
process::win32....
qsort......
regexp.SSS.........
rmdir.....
sha1...
sha256....
sortedcache...
stat..
str::basic...
str::oom...
str::percent..
str::quote...
str::splice.........
string........
strmap...........
strtol........
url::http.................................................
url::joinpath......
url::parse......................................................
url::pattern..
url::redirect...........
url::scp.....................
url::valid.
utf8.
vector..........
wildmatch........
zstream....

  1) Failure:
process::env::can_clear_env [D:\Apps\FritzingEntirity\libgit2-1.8.1\tests\util\process\env.c:52]
  0 != result.exitcode
  0 != 1



0% tests passed, 1 tests failed out of 1

Total Test time (real) =   4.05 sec

The following tests FAILED:
         12 - util (Failed)
Errors while running CTest
PS D:\Apps\FritzingEntirity\libgit2-1.8.1\build>

D:/Apps/FritzingEntirity/libgit2-1.8.1/build/Testing/Temporary/LastTest.log :

12:util

Version of libgit2 (release number or SHA1)

libgit2 v1.8.1

Operating system(s) tested

Edition Windows 11 Home Single Language
Version 23H2
Installed on ‎05-‎02-‎2023
OS build 22631.4169
Experience Windows Feature Experience Pack 1000.22700.1034.0

Windows PowerShell

Start with tests/util/process/env.c at line 52 and reproduce the failure by running ctest -R util on Windows. Check the process environment test and the reported temporary path behavior; done means the util test passes on Windows without the CMD.EXE or UNC-path errors.