Fix cygwin test failure due to shortpath usage

Two tests are failing on Cygwin because the argument is passed as
a long-path and the Path is ending up as a short-path:

AllPlatformTests.test_run_target_files_path

  Traceback (most recent call last):
    File "/cygdrive/d/a/meson/meson/test cases/common/51 run target/check-env.py", line 22, in <module>
      assert build_root == env_build_root
  AssertionError

SubprojectsCommandTests.test_purge

  >       self.assertEqual(deleting(out), sorted([
              str(self.subprojects_dir / 'redirect.wrap'),
              str(self.subprojects_dir / 'sub_file'),
              str(self.subprojects_dir / 'sub_git'),
          ]))
  E       AssertionError: Lists differ: ['/cygdrive/c/Users/runneradmin/AppData/Local/Temp/tmpeaa2a49[205 chars]git'] != ['/cygdrive/c/Users/RUNNER~1/AppData/Local/Temp/tmpeaa2a49z/s[196 chars]git']

  [...]

  ['/cygdrive/c/Users/runneradmin/AppData/Local/Temp/tmpeaa2a49z/src/subprojects/redirect.wrap',
                      ^^^^^^^^^^^
  ['/cygdrive/c/Users/RUNNER~1/AppData/Local/Temp/tmpeaa2a49z/src/subprojects/redirect.wrap',
                      ^^^^^^^^

The fix is to not use the tempdir for all tests, but only for tests
that check the mode.

1 files changed, 6 insertions, 0 deletions

diff --git a/unittests/linuxliketests.py b/unittests/linuxliketests.py
index 75888b3..0f99f01 100644
--- a/unittests/linuxliketests.py
+++ b/unittests/linuxliketests.py
@@ -574,6 +574,8 @@ class LinuxlikeTests(BasePlatformTests):
         Test that files installed by these tests have the correct permissions.
         Can't be an ordinary test because our installed_files.txt is very basic.
         '''
+        if is_cygwin():
+            self.new_builddir_in_tempdir()
         # Test file modes
         testdir = os.path.join(self.common_test_dir, '12 data')
         self.init(testdir)
@@ -626,6 +628,8 @@ class LinuxlikeTests(BasePlatformTests):
         '''
         Test that files are installed with correct permissions using install_mode.
         '''
+        if is_cygwin():
+            self.new_builddir_in_tempdir()
         testdir = os.path.join(self.common_test_dir, '190 install_mode')
         self.init(testdir)
         self.build()
@@ -664,6 +668,8 @@ class LinuxlikeTests(BasePlatformTests):
         install umask of 022, regardless of the umask at time the worktree
         was checked out or the build was executed.
         '''
+        if is_cygwin():
+            self.new_builddir_in_tempdir()
         # Copy source tree to a temporary directory and change permissions
         # there to simulate a checkout with umask 002.
         orig_testdir = os.path.join(self.unit_test_dir, '26 install umask')