diff --git a/swh/lister/bitbucket/tests/conftest.py b/swh/lister/bitbucket/tests/conftest.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/bitbucket/tests/conftest.py
@@ -0,0 +1,32 @@
+# 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 "bitbucket"
+
+
+@pytest.fixture
+def lister_bitbucket(swh_lister):
+    for task_type in [
+        {
+            "type": "load-git",
+            "description": "Load git repository",
+            "backend_name": "swh.loader.git.tasks.UpdateGitRepository",
+            "default_interval": "1 day",
+        },
+        {
+            "type": "load-hg",
+            "description": "Load hg repository",
+            "backend_name": "swh.loader.mercurial.tasks.LoadMercurial",
+            "default_interval": "1 day",
+        },
+    ]:
+        swh_lister.scheduler.create_task_type(task_type)
+
+    return swh_lister
diff --git a/swh/lister/bitbucket/tests/test_lister.py b/swh/lister/bitbucket/tests/test_lister.py
--- a/swh/lister/bitbucket/tests/test_lister.py
+++ b/swh/lister/bitbucket/tests/test_lister.py
@@ -9,18 +9,12 @@
 from urllib.parse import unquote
 
 import iso8601
-import pytest
 import requests_mock
 
 from swh.lister.bitbucket.lister import BitBucketLister
 from swh.lister.core.tests.test_lister import HttpListerTester
 
 
-@pytest.fixture
-def lister_under_test():
-    return "bitbucket"
-
-
 def _convert_type(req_index):
     """Convert the req_index to its right type according to the model's
        "indexable" column.
@@ -85,15 +79,13 @@
         )
 
 
-def test_lister_bitbucket(swh_lister, requests_mock_datadir):
+def test_lister_bitbucket(lister_bitbucket, requests_mock_datadir):
     """Simple bitbucket listing should create scheduled tasks (git, hg)
 
     """
-    lister = swh_lister
-
-    lister.run()
+    lister_bitbucket.run()
 
-    r = lister.scheduler.search_tasks(task_type="load-hg")
+    r = lister_bitbucket.scheduler.search_tasks(task_type="load-hg")
     assert len(r) == 9
 
     for row in r:
@@ -109,7 +101,7 @@
         assert row["policy"] == "recurring"
         assert row["priority"] is None
 
-    r = lister.scheduler.search_tasks(task_type="load-git")
+    r = lister_bitbucket.scheduler.search_tasks(task_type="load-git")
     assert len(r) == 1
 
     for row in r:
diff --git a/swh/lister/cgit/tests/conftest.py b/swh/lister/cgit/tests/conftest.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/cgit/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 "cgit"
+
+
+@pytest.fixture
+def lister_cgit(swh_lister):
+    for task_type in [
+        {
+            "type": "load-git",
+            "description": "Load git repository",
+            "backend_name": "swh.loader.git.tasks.UpdateGitRepository",
+            "default_interval": "1 day",
+        },
+    ]:
+        swh_lister.scheduler.create_task_type(task_type)
+
+    return swh_lister
diff --git a/swh/lister/cgit/tests/test_lister.py b/swh/lister/cgit/tests/test_lister.py
--- a/swh/lister/cgit/tests/test_lister.py
+++ b/swh/lister/cgit/tests/test_lister.py
@@ -2,22 +2,13 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-import pytest
-
 from swh.lister import __version__
 
 
-@pytest.fixture
-def lister_under_test():
-    return "cgit"
-
-
-def test_lister_no_page(requests_mock_datadir, swh_lister):
-    lister = swh_lister
+def test_lister_cgit_no_page(requests_mock_datadir, lister_cgit):
+    assert lister_cgit.url == "https://git.savannah.gnu.org/cgit/"
 
-    assert lister.url == "https://git.savannah.gnu.org/cgit/"
-
-    repos = list(lister.get_repos())
+    repos = list(lister_cgit.get_repos())
     assert len(repos) == 977
 
     assert repos[0] == "https://git.savannah.gnu.org/cgit/elisp-es.git/"
@@ -27,12 +18,10 @@
     assert repos[-2] == "http://example.org/cgit/xstarcastle.git/"
 
 
-def test_lister_model(requests_mock_datadir, swh_lister):
-    lister = swh_lister
-
-    repo = next(lister.get_repos())
+def test_lister_cgit_model(requests_mock_datadir, lister_cgit):
+    repo = next(lister_cgit.get_repos())
 
-    model = lister.build_model(repo)
+    model = lister_cgit.build_model(repo)
     assert model == {
         "uid": "https://git.savannah.gnu.org/cgit/elisp-es.git/",
         "name": "elisp-es.git",
@@ -42,21 +31,19 @@
     }
 
 
-def test_lister_with_pages(requests_mock_datadir, swh_lister):
-    lister = swh_lister
-    lister.url = "https://git.tizen/cgit/"
+def test_lister_cgit_with_pages(requests_mock_datadir, lister_cgit):
+    lister_cgit.url = "https://git.tizen/cgit/"
 
-    repos = list(lister.get_repos())
+    repos = list(lister_cgit.get_repos())
     # we should have 16 repos (listed on 3 pages)
     assert len(repos) == 16
 
 
-def test_lister_run(requests_mock_datadir, swh_lister):
-    lister = swh_lister
-    lister.url = "https://git.tizen/cgit/"
-    lister.run()
+def test_lister_cgit_run(requests_mock_datadir, lister_cgit):
+    lister_cgit.url = "https://git.tizen/cgit/"
+    lister_cgit.run()
 
-    r = lister.scheduler.search_tasks(task_type="load-git")
+    r = lister_cgit.scheduler.search_tasks(task_type="load-git")
     assert len(r) == 16
 
     for row in r:
@@ -75,10 +62,9 @@
         assert row["priority"] is None
 
 
-def test_lister_requests(requests_mock_datadir, swh_lister):
-    lister = swh_lister
-    lister.url = "https://git.tizen/cgit/"
-    lister.run()
+def test_lister_cgit_requests(requests_mock_datadir, lister_cgit):
+    lister_cgit.url = "https://git.tizen/cgit/"
+    lister_cgit.run()
 
     assert len(requests_mock_datadir.request_history) != 0
     for request in requests_mock_datadir.request_history:
diff --git a/swh/lister/cran/tests/conftest.py b/swh/lister/cran/tests/conftest.py
--- a/swh/lister/cran/tests/conftest.py
+++ b/swh/lister/cran/tests/conftest.py
@@ -13,7 +13,6 @@
 
 @pytest.fixture
 def lister_cran(swh_lister):
-    # Add the load-cran in the scheduler backend
     swh_lister.scheduler.create_task_type(
         {
             "type": "load-cran",
diff --git a/swh/lister/cran/tests/test_lister.py b/swh/lister/cran/tests/test_lister.py
--- a/swh/lister/cran/tests/test_lister.py
+++ b/swh/lister/cran/tests/test_lister.py
@@ -29,17 +29,15 @@
 
 @patch("swh.lister.cran.lister.read_cran_data")
 def test_cran_lister_cran(mock_cran, datadir, lister_cran):
-    lister = lister_cran
-
     with open(path.join(datadir, "list-r-packages.json")) as f:
         data = json.loads(f.read())
 
     mock_cran.return_value = data
     assert len(data) == 6
 
-    lister.run()
+    lister_cran.run()
 
-    r = lister.scheduler.search_tasks(task_type="load-cran")
+    r = lister_cran.scheduler.search_tasks(task_type="load-cran")
     assert len(r) == 6
 
     for row in r:
@@ -63,7 +61,7 @@
 
         origin_url = kwargs["url"]
         record = (
-            lister.db_session.query(lister.MODEL)
+            lister_cran.db_session.query(lister_cran.MODEL)
             .filter(origin_url == origin_url)
             .first()
         )
diff --git a/swh/lister/gitea/tests/conftest.py b/swh/lister/gitea/tests/conftest.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitea/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 "gitea"
+
+
+@pytest.fixture
+def lister_gitea(swh_lister):
+    for task_type in [
+        {
+            "type": "load-git",
+            "description": "Load git repository",
+            "backend_name": "swh.loader.git.tasks.UpdateGitRepository",
+            "default_interval": "1 day",
+        },
+    ]:
+        swh_lister.scheduler.create_task_type(task_type)
+
+    return swh_lister
diff --git a/swh/lister/gitea/tests/test_lister.py b/swh/lister/gitea/tests/test_lister.py
--- a/swh/lister/gitea/tests/test_lister.py
+++ b/swh/lister/gitea/tests/test_lister.py
@@ -7,8 +7,6 @@
 import re
 import unittest
 
-import pytest
-
 from swh.lister.core.tests.test_lister import HttpListerTesterBase
 from swh.lister.gitea.lister import GiteaLister
 
@@ -40,16 +38,9 @@
         return headers
 
 
-@pytest.fixture
-def lister_under_test():
-    return "gitea"
-
-
-def test_lister_gitea(swh_lister, requests_mock_datadir):
-    lister: GiteaLister = swh_lister
-
-    lister.run()
-    r = lister.scheduler.search_tasks(task_type="load-git")
+def test_lister_gitea(lister_gitea, requests_mock_datadir):
+    lister_gitea.run()
+    r = lister_gitea.scheduler.search_tasks(task_type="load-git")
     assert len(r) == 3
 
     for row in r:
diff --git a/swh/lister/github/tests/conftest.py b/swh/lister/github/tests/conftest.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/github/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 "github"
+
+
+@pytest.fixture
+def lister_github(swh_lister):
+    for task_type in [
+        {
+            "type": "load-git",
+            "description": "Load git repository",
+            "backend_name": "swh.loader.git.tasks.UpdateGitRepository",
+            "default_interval": "1 day",
+        },
+    ]:
+        swh_lister.scheduler.create_task_type(task_type)
+
+    return swh_lister
diff --git a/swh/lister/github/tests/test_lister.py b/swh/lister/github/tests/test_lister.py
--- a/swh/lister/github/tests/test_lister.py
+++ b/swh/lister/github/tests/test_lister.py
@@ -6,7 +6,6 @@
 import re
 import unittest
 
-import pytest
 import requests_mock
 
 from swh.lister.core.tests.test_lister import HttpListerTester
@@ -58,18 +57,13 @@
         )
 
 
-@pytest.fixture
-def lister_under_test():
-    return "github"
-
-
-def test_lister_github(swh_lister, requests_mock_datadir):
+def test_lister_github(lister_github, requests_mock_datadir):
     """Simple github listing should create scheduled tasks
 
     """
-    swh_lister.run()
+    lister_github.run()
 
-    r = swh_lister.scheduler.search_tasks(task_type="load-git")
+    r = lister_github.scheduler.search_tasks(task_type="load-git")
     assert len(r) == 100
 
     for row in r:
diff --git a/swh/lister/gitlab/tests/conftest.py b/swh/lister/gitlab/tests/conftest.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/gitlab/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 "gitlab"
+
+
+@pytest.fixture
+def lister_gitlab(swh_lister):
+    for task_type in [
+        {
+            "type": "load-git",
+            "description": "Load git repository",
+            "backend_name": "swh.loader.git.tasks.UpdateGitRepository",
+            "default_interval": "1 day",
+        },
+    ]:
+        swh_lister.scheduler.create_task_type(task_type)
+
+    return swh_lister
diff --git a/swh/lister/gitlab/tests/test_lister.py b/swh/lister/gitlab/tests/test_lister.py
--- a/swh/lister/gitlab/tests/test_lister.py
+++ b/swh/lister/gitlab/tests/test_lister.py
@@ -49,10 +49,10 @@
     return "gitlab"
 
 
-def test_lister_gitlab(swh_lister, requests_mock_datadir):
-    swh_lister.run()
+def test_lister_gitlab(lister_gitlab, requests_mock_datadir):
+    lister_gitlab.run()
 
-    r = swh_lister.scheduler.search_tasks(task_type="load-git")
+    r = lister_gitlab.scheduler.search_tasks(task_type="load-git")
     assert len(r) == 10
 
     for row in r:
diff --git a/swh/lister/gnu/tests/conftest.py b/swh/lister/gnu/tests/conftest.py
new file mode 100644
--- /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
--- 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"
-
-
-@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:
diff --git a/swh/lister/launchpad/tests/conftest.py b/swh/lister/launchpad/tests/conftest.py
--- a/swh/lister/launchpad/tests/conftest.py
+++ b/swh/lister/launchpad/tests/conftest.py
@@ -44,4 +44,13 @@
         mock_lp_response(i) for i in range(3)
     ]
 
+    lister.scheduler.create_task_type(
+        {
+            "type": "load-git",
+            "description": "Load git repository",
+            "backend_name": "swh.loader.git.tasks.UpdateGitRepository",
+            "default_interval": "1 day",
+        }
+    )
+
     return lister
diff --git a/swh/lister/npm/tests/test_lister.py b/swh/lister/npm/tests/test_lister.py
--- a/swh/lister/npm/tests/test_lister.py
+++ b/swh/lister/npm/tests/test_lister.py
@@ -73,7 +73,7 @@
         assert row["priority"] is None
 
 
-def test_lister_npm_basic_listing(lister_npm, requests_mock_datadir):
+def test_npm_lister_basic_listing(lister_npm, requests_mock_datadir):
     lister_npm.run()
 
     tasks = lister_npm.scheduler.search_tasks(task_type="load-npm")
@@ -82,7 +82,7 @@
     check_tasks(tasks)
 
 
-def test_lister_npm_listing_pagination(lister_npm, requests_mock_datadir):
+def test_npm_lister_listing_pagination(lister_npm, requests_mock_datadir):
     lister = lister_npm
     # Patch per page pagination
     lister.per_page = 10 + 1
diff --git a/swh/lister/phabricator/tests/conftest.py b/swh/lister/phabricator/tests/conftest.py
--- a/swh/lister/phabricator/tests/conftest.py
+++ b/swh/lister/phabricator/tests/conftest.py
@@ -18,5 +18,13 @@
         "cache_responses": False,
         "credentials": {"phabricator": {swh_lister.instance: [{"password": "foo"}]}},
     }
+    swh_lister.scheduler.create_task_type(
+        {
+            "type": "load-git",
+            "description": "Load git repository",
+            "backend_name": "swh.loader.git.tasks.UpdateGitRepository",
+            "default_interval": "1 day",
+        }
+    )
 
     return swh_lister