diff --git a/src/ensembl/utils/plugin.py b/src/ensembl/utils/plugin.py
index c286fd2..e6ffacb 100644
--- a/src/ensembl/utils/plugin.py
+++ b/src/ensembl/utils/plugin.py
@@ -199,7 +199,7 @@ def test_method(..., test_dbs: dict[str, UnitTestDB], ...):
         name = argument.get("name", None)
         try:
             key = name if name else src.name
-        except AttributeError:
-            raise TypeError("Expected at least 'src' or 'name' argument defined")
+        except AttributeError as exc:
+            raise TypeError("Expected at least 'src' or 'name' argument defined") from exc
         databases[key] = db_factory(src=src, name=name, metadata=argument.get("metadata"))
     return databases
diff --git a/tests/plugin/test_plugin.py b/tests/plugin/test_plugin.py
index 8ac4985..24cf446 100644
--- a/tests/plugin/test_plugin.py
+++ b/tests/plugin/test_plugin.py
@@ -139,5 +139,6 @@ def test_db_factory(
     indirect=["test_dbs"],
 )
 def test_test_dbs(test_dbs: dict[str, UnitTestDB], expected_db_name: str) -> None:
+    """Tests the `test_dbs` fixture."""
     assert expected_db_name in test_dbs
     assert test_dbs[expected_db_name].dbc is not None