diff --git a/swh/loader/metadata/tests/test_base.py b/swh/loader/metadata/tests/test_base.py
--- a/swh/loader/metadata/tests/test_base.py
+++ b/swh/loader/metadata/tests/test_base.py
@@ -63,6 +63,7 @@
 
 class DummyMetadataFetcher(BaseMetadataFetcher):
     SUPPORTED_LISTERS = {"fake-lister"}
+    FETCHER_NAME = "dummy"
 
     def __init__(self, origin, credentials, lister_name, lister_instance_name):
         pass