tests: test_subcmds_sync.py: fix for py3.6 & 3.7

tests/test_subcmds_sync.py::LocalSyncState::test_prune_removed_projects
was failing in Python 3.6 and 3.7 due to topdir not being set with the
following error message:
    TypeError: expected str, bytes or os.PathLike object, not MagicMock

topdir is accessed from within PruneRemovedProjects().

Test: tox with Python 3.6 to 3.11
Change-Id: I7ba5144df0a0126c01776384e2178136c3510091
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/382816
Reviewed-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Daniel Kutik <daniel.kutik@lavawerk.com>
Tested-by: Daniel Kutik <daniel.kutik@lavawerk.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/tests/test_subcmds_sync.py b/tests/test_subcmds_sync.py
index b9f0a746..71e40489 100644
--- a/tests/test_subcmds_sync.py
+++ b/tests/test_subcmds_sync.py
@@ -117,8 +117,12 @@ class LocalSyncState(unittest.TestCase):
 
     def setUp(self):
         """Common setup."""
-        self.repodir = tempfile.mkdtemp(".repo")
+        self.topdir = tempfile.mkdtemp("LocalSyncState")
+        self.repodir = os.path.join(self.topdir, ".repo")
+        os.makedirs(self.repodir)
+
         self.manifest = mock.MagicMock(
+            topdir=self.topdir,
             repodir=self.repodir,
             repoProject=mock.MagicMock(relpath=".repo/repo"),
         )
@@ -126,7 +130,7 @@ class LocalSyncState(unittest.TestCase):
 
     def tearDown(self):
         """Common teardown."""
-        shutil.rmtree(self.repodir)
+        shutil.rmtree(self.topdir)
 
     def _new_state(self, time=_TIME):
         with mock.patch("time.time", return_value=time):