diff --git a/swh/lister/gnu/tests/conftest.py b/swh/lister/gnu/tests/conftest.py
new file mode 100644
index 0000000..23cd215
--- /dev/null
+++ b/swh/lister/gnu/tests/conftest.py
@@ -0,0 +1,26 @@
+# 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 pytest
+
+
+@pytest.fixture
+def lister_under_test():
+    return "gnu"
+
+
+@pytest.fixture
+def lister_gnu(swh_lister):
+    for task_type in [
+        {
+            "type": "load-archive-files",
+            "description": "Load archive repository",
+            "backend_name": "swh.loader.packages.tasks.LoadArchive",
+            "default_interval": "1 day",
+        },
+    ]:
+        swh_lister.scheduler.create_task_type(task_type)
+
+    return swh_lister
diff --git a/swh/lister/gnu/tests/test_lister.py b/swh/lister/gnu/tests/test_lister.py
index 8dedfa9..e17365a 100644
--- a/swh/lister/gnu/tests/test_lister.py
+++ b/swh/lister/gnu/tests/test_lister.py
@@ -1,55 +1,47 @@
 # 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 logging
 
-import pytest
-
 logger = logging.getLogger(__name__)
 
 
-@pytest.fixture
-def lister_under_test():
-    return "gnu"
-
-
-@pytest.fixture
-def test_gnu_lister(swh_lister, requests_mock_datadir):
-    swh_lister.run()
+def test_gnu_lister(lister_gnu, requests_mock_datadir):
+    lister_gnu.run()
 
-    r = swh_lister.scheduler.search_tasks(task_type="load-archive-files")
+    r = lister_gnu.scheduler.search_tasks(task_type="load-archive-files")
     assert len(r) == 383
 
     for row in r:
         assert row["type"] == "load-archive-files"
         # arguments check
         args = row["arguments"]["args"]
         assert len(args) == 0
 
         # kwargs
         kwargs = row["arguments"]["kwargs"]
         assert set(kwargs.keys()) == {"url", "artifacts"}
 
         url = kwargs["url"]
         assert url.startswith("https://ftp.gnu.org")
 
         url_suffix = url.split("https://ftp.gnu.org")[1]
         assert "gnu" in url_suffix or "old-gnu" in url_suffix
 
         artifacts = kwargs["artifacts"]
         # check the artifact's structure
         artifact = artifacts[0]
         assert set(artifact.keys()) == {"url", "length", "time", "filename", "version"}
 
         for artifact in artifacts:
             logger.debug(artifact)
             # 'time' is an isoformat string now
             for key in ["url", "time", "filename", "version"]:
                 assert isinstance(artifact[key], str)
             assert isinstance(artifact["length"], int)
 
         assert row["policy"] == "oneshot"
         assert row["priority"] is None
         assert row["retries_left"] == 3