diff --git a/swh/loader/mercurial/tests/common.py b/swh/loader/mercurial/tests/common.py
index d82d52d..b05ba2b 100644
--- a/swh/loader/mercurial/tests/common.py
+++ b/swh/loader/mercurial/tests/common.py
@@ -1,58 +1,59 @@
 # Copyright (C) 2018-2019  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from swh.loader.mercurial.loader import (
     HgBundle20Loader, HgArchiveBundle20Loader
 )
 
 
 _LOADER_TEST_CONFIG = {
     'bundle_filename': 'HG20_none_bundle',
     'cache1_size': 838860800,
     'cache2_size': 838860800,
     'clone_timeout_seconds': 2 * 3600,
     'log_db': 'dbname=softwareheritage-log',
     'reduce_effort': False,
     'save_data': False,
     'save_data_path': '',
     'max_content_size': 104857600,
     'storage': {
         'cls': 'pipeline',
         'steps': [
             {'cls': 'filter'},
+            {'cls': 'validate'},
             {'cls': 'memory'},
         ]
     },
     'temp_directory': '/tmp/swh.loader.mercurial'
 }
 
 
 class BaseHgLoaderMemoryStorage:
     """The base mercurial loader to test.
 
      Mixin behavior changed to:
     - use an in-memory storage
     - not use the default configuration loading mechanism
 
     At the end of the tests, you can make sure you have the rights
     objects.
 
     """
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.origin_id = 1
         self.visit = 1
 
     def parse_config_file(self, *args, **kwargs):
         return _LOADER_TEST_CONFIG
 
 
 class HgLoaderMemoryStorage(BaseHgLoaderMemoryStorage, HgBundle20Loader):
     pass
 
 
 class HgArchiveLoaderMemoryStorage(BaseHgLoaderMemoryStorage,
                                    HgArchiveBundle20Loader):
     pass