diff --git a/swh/loader/mercurial/tests/common.py b/swh/loader/mercurial/tests/common.py
--- a/swh/loader/mercurial/tests/common.py
+++ b/swh/loader/mercurial/tests/common.py
@@ -22,6 +22,7 @@
         'cls': 'pipeline',
         'steps': [
             {'cls': 'filter'},
+            {'cls': 'validate'},
             {'cls': 'memory'},
         ]
     },