Serialize multi-sample manifest path

backend/tests/test_sprint178_mol_operational_pack.py

@@ -98,6 +98,7 @@ def test_real_data_matrix_propagates_project_region_and_persisted_area() -> None
     assert 'project_region="Mol, Kempen"' in multi
     assert 'REAL_PROJECT_REGION="${project_region}"' in multi
     assert 'manifest_path = Path(sys.argv[3])' in multi
+    assert '"operator_sample_manifest_path": str(manifest_path)' in multi
 
 
 def test_mol_operational_runner_uses_real_positive_qa_and_background_paths() -> None: