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
@@ -5,21 +5,13 @@
 
 import logging
 
-import pytest
-
 logger = logging.getLogger(__name__)
 
 
-@pytest.fixture
-def lister_under_test():
-    return "gnu"
+def test_gnu_lister(lister_gnu, requests_mock_datadir):
+    lister_gnu.run()
 
-
-@pytest.fixture
-def test_gnu_lister(swh_lister, requests_mock_datadir):
-    swh_lister.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: