feat: Enhance ID mapping service robustness, add defensive guards, and expand migration engine and API testing.

backend/tests/core/test_defensive_guards.py

@@ -0,0 +1,24 @@
+import pytest
+from unittest.mock import MagicMock
+from src.services.git_service import GitService
+from src.core.superset_client import SupersetClient
+from src.core.config_models import Environment
+
+def test_git_service_get_repo_path_guard():
+    """Verify that _get_repo_path raises ValueError if dashboard_id is None."""
+    service = GitService(base_path="test_repos")
+    with pytest.raises(ValueError, match="dashboard_id cannot be None"):
+        service._get_repo_path(None)
+
+def test_superset_client_import_dashboard_guard():
+    """Verify that import_dashboard raises ValueError if file_name is None."""
+    mock_env = Environment(
+        id="test",
+        name="test",
+        url="http://localhost:8088",
+        username="admin",
+        password="admin"
+    )
+    client = SupersetClient(mock_env)
+    with pytest.raises(ValueError, match="file_name cannot be None"):
+        client.import_dashboard(None)