test: Fix path test for CI with detailed comment on necessity

tests/test_project.py

@@ -2598,7 +2598,9 @@ def operation_info(self, request):
         ids=None if skip_git else ("git-dirty", "git-clean"),
     )
     def git_repo(self, project, request):
-        if request.param is None:
+        # params=None is equivalent to not passing a parameter which results in
+        # result.param being unset.
+        if not hasattr(request, "param"):
             return
         repo = git.Repo.init(project.path)
         with open(project.fn("test.txt"), "w"):
@@ -2644,7 +2646,15 @@ def check_metadata(
         repo,
     ):
         assert metadata["stage"] == expected_stage
-        assert job.project.path == metadata["project"]["path"]
+        # When running on MacOS CI a private/ is prepended to job.project.path
+        # when querying the path on a fork. Since for local tests to work we
+        # cannot modify anything, the best we can do is either check for the
+        # private prefix and remove or check for the stored path being a subset
+        # of the current path.
+        test_path = metadata["project"]["path"]
+        if "private" in test_path:
+            test_path = os.path.join(*test_path.split(os.path.sep)[1:])
+        assert job.project.path == test_path
         assert metadata["project"]["schema_version"] == job.project.config.get(
             "schema_version"
         )