diff --git a/backend/pashub_fetcher/tests/test_pashub_service.py b/backend/pashub_fetcher/tests/test_pashub_service.py
index 988dc854..c00e12b1 100644
--- a/backend/pashub_fetcher/tests/test_pashub_service.py
+++ b/backend/pashub_fetcher/tests/test_pashub_service.py
@@ -502,6 +502,33 @@ def test_run_persists_other_files_with_other_file_type() -> None:
     assert all_added[0].file_type == FileTypeEnum.OTHER.value
 
 
+def test_run_persists_mcs_cert_with_mcs_certificate_file_type() -> None:
+    # Arrange
+    mock_client = MagicMock(spec=PashubClient)
+    mock_client.get_uprn_by_job_id.return_value = None
+    mock_client.get_evidence_files_by_job_id.return_value = DownloadedFiles(
+        core=[DownloadedFile("/tmp/MCS_cert.pdf", "MCS Compliance Certificate", datetime(2024, 1, 1))],
+        other=[],
+    )
+
+    fake_session = MagicMock()
+    service = make_service(pashub_client=mock_client)
+
+    # Act
+    with (
+        patch("backend.pashub_fetcher.pashub_service.upload_file_to_s3"),
+        patch("backend.pashub_fetcher.pashub_service.db_session") as mock_db,
+        patch("backend.pashub_fetcher.pashub_service.os.remove"),
+    ):
+        mock_db.return_value.__enter__.return_value = fake_session
+        service.run(make_request(uprn="12345"))
+
+    # Assert
+    fake_session.add_all.assert_called_once()
+    added: list[Any] = fake_session.add_all.call_args[0][0]
+    assert added[0].file_type == FileTypeEnum.MCS_CERTIFICATE.value
+
+
 def test_run_warns_and_continues_when_site_notes_parsing_fails() -> None:
     mock_client = MagicMock(spec=PashubClient)
     mock_client.get_uprn_by_job_id.return_value = None