diff --git a/conftest.py b/conftest.py
index b4e1cde..a74eea4 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,15 +1,19 @@
 # Copyright (C) 2020  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
 
 import pytest
 
-pytest_plugins = ["swh.scheduler.pytest_plugin", "swh.storage.pytest_plugin"]
+pytest_plugins = [
+    "swh.scheduler.pytest_plugin",
+    "swh.storage.pytest_plugin",
+    "swh.loader.pytest_plugin",
+]
 
 
 @pytest.fixture(scope="session")
 def swh_scheduler_celery_includes(swh_scheduler_celery_includes):
     return swh_scheduler_celery_includes + [
         "swh.loader.mercurial.tasks",
     ]
diff --git a/requirements-swh.txt b/requirements-swh.txt
index b96d556..55c5e97 100644
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,4 +1,4 @@
 swh.model >= 0.4.0
 swh.storage >= 0.10.0
 swh.scheduler >= 0.0.39
-swh.loader.core >= 0.5.5
+swh.loader.core >= 0.5.9
diff --git a/swh/loader/mercurial/tests/conftest.py b/swh/loader/mercurial/tests/conftest.py
index 22b0736..78e9f6c 100644
--- a/swh/loader/mercurial/tests/conftest.py
+++ b/swh/loader/mercurial/tests/conftest.py
@@ -1,53 +1,41 @@
 # Copyright (C) 2019-2020  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
 
-import os
-import yaml
-
 import pytest
 
 from typing import Any, Dict
 
 
 @pytest.fixture
 def swh_loader_config(swh_storage_backend_config, tmp_path) -> Dict[str, Any]:
     swh_storage_backend_config["journal_writer"] = {}
     return {
         "storage": {
             "cls": "pipeline",
             "steps": [
                 {"cls": "filter"},
                 {
                     "cls": "buffer",
                     "min_batch_size": {
                         "content": 10000,
                         "content_bytes": 1073741824,
                         "directory": 2500,
                         "revision": 10,
                         "release": 100,
                     },
                 },
                 swh_storage_backend_config,
             ],
         },
         "bundle_filename": "HG20_none_bundle",
         "cache1_size": 838860800,
         "cache2_size": 838860800,
         "clone_timeout_seconds": 2 * 3600,
         "reduce_effort": False,
         "save_data": False,
         "save_data_path": "",
         "max_content_size": 104857600,
         "temp_directory": str(tmp_path),
     }
-
-
-@pytest.fixture
-def swh_config(swh_loader_config, monkeypatch, tmp_path):
-    conffile = os.path.join(str(tmp_path), "loader.yml")
-    with open(conffile, "w") as f:
-        f.write(yaml.dump(swh_loader_config))
-    monkeypatch.setenv("SWH_CONFIG_FILENAME", conffile)
-    return conffile