lister.tests: Add missing task_type for package listers

The scheduler module no longer initializes itself those task_type.

swh/lister/gnu/lister.py

@@ -49,6 +49,7 @@ class GNULister(SimpleLister):
 
         """
         artifacts = self.gnu_tree.artifacts[origin_url]
+        assert origin_type == 'tar'
         return utils.create_task_dict(
             'load-%s' % origin_type,
             kwargs.get('policy', 'oneshot'),

swh/lister/gnu/tests/conftest.py

@@ -1 +1,23 @@
+# Copyright (C) 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
+
+import pytest
+
 from swh.lister.core.tests.conftest import *  # noqa
+
+
+@pytest.fixture
+def lister_gnu(swh_listers):
+    lister = swh_listers['gnu']
+
+    # Add the load-deb-package in the scheduler backend
+    lister.scheduler.create_task_type({
+        'type': 'load-tar',
+        'description': 'Load archive files',
+        'backend_name': 'swh.loader.package.tasks.LoadArchive',
+        'default_interval': '1 day',
+    })
+
+    return lister

swh/lister/gnu/tests/test_lister.py

@@ -9,12 +9,10 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-def test_gnu_lister(swh_listers, requests_mock_datadir):
-    lister = swh_listers['gnu']
+def test_gnu_lister(lister_gnu, requests_mock_datadir):
+    lister_gnu.run()
 
-    lister.run()
-
-    r = lister.scheduler.search_tasks(task_type='load-tar')
+    r = lister_gnu.scheduler.search_tasks(task_type='load-tar')
     assert len(r) == 383
 
     for row in r: