Add symlink test for local checkout of cable

Author: abhaasgoyal

tests/test_workdir.py

@@ -85,11 +85,20 @@ def revision_log_file(self) -> Path:
     def pbs_job_file(self, request) -> Path:
         return Path(request.param)
 
-    def test_clean_realisation_files(self, src_path, revision_log_file):
+    def test_clean_realisation_files(
+        self, src_path: Path, tmp_path: Path, revision_log_file: Path
+    ):
         """Success case: directory tree does not exist after clean."""
         src_path.mkdir()
+        cable_symlink = src_path / "main"
+        # tmp_path contains the path being symlinked
+        local_cable_src_path = tmp_path / "CABLE"
+        local_cable_src_path.mkdir()
+        cable_symlink.symlink_to(local_cable_src_path)
         revision_log_file.touch()
         clean_realisation_files()
+
+        assert local_cable_src_path.exists()
         assert not src_path.exists()
         assert not revision_log_file.exists()