diff --git a/MANIFEST.in b/MANIFEST.in
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,6 +2,7 @@
 include README
 include requirements*.txt
 include version.txt
+include conftest.py
 include swh/lister/cran/list_all_packages.R
 recursive-include swh/lister/*/tests/data/ *
 recursive-include swh py.typed
diff --git a/conftest.py b/conftest.py
--- a/conftest.py
+++ b/conftest.py
@@ -7,7 +7,7 @@
 
 import pytest
 
-pytest_plugins = ["swh.scheduler.pytest_plugin"]
+pytest_plugins = ["swh.scheduler.pytest_plugin", "swh.lister.pytest_plugin"]
 
 os.environ["LC_ALL"] = "C.UTF-8"
 
diff --git a/swh/lister/bitbucket/tests/conftest.py b/swh/lister/bitbucket/tests/conftest.py
deleted file mode 100644
--- a/swh/lister/bitbucket/tests/conftest.py
+++ /dev/null
@@ -1 +0,0 @@
-from swh.lister.core.tests.conftest import *  # noqa
diff --git a/swh/lister/cgit/tests/conftest.py b/swh/lister/cgit/tests/conftest.py
deleted file mode 100644
--- a/swh/lister/cgit/tests/conftest.py
+++ /dev/null
@@ -1 +0,0 @@
-from swh.lister.core.tests.conftest import *  # noqa
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
@@ -5,8 +5,6 @@
 
 import pytest
 
-from swh.lister.core.tests.conftest import *  # noqa
-
 
 @pytest.fixture
 def lister_cran(swh_listers):
diff --git a/swh/lister/debian/tests/conftest.py b/swh/lister/debian/tests/conftest.py
--- a/swh/lister/debian/tests/conftest.py
+++ b/swh/lister/debian/tests/conftest.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2019 The Software Heritage developers
+# 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
@@ -9,7 +9,6 @@
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 
-from swh.lister.core.tests.conftest import *  # noqa
 from swh.lister.core.models import SQLBase
 from swh.lister.debian import debian_init
 
diff --git a/swh/lister/gitea/tests/conftest.py b/swh/lister/gitea/tests/conftest.py
deleted file mode 100644
--- a/swh/lister/gitea/tests/conftest.py
+++ /dev/null
@@ -1,6 +0,0 @@
-# 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
-
-from swh.lister.core.tests.conftest import *  # noqa
diff --git a/swh/lister/github/tests/conftest.py b/swh/lister/github/tests/conftest.py
deleted file mode 100644
--- a/swh/lister/github/tests/conftest.py
+++ /dev/null
@@ -1 +0,0 @@
-from swh.lister.core.tests.conftest import *  # noqa
diff --git a/swh/lister/gitlab/tests/conftest.py b/swh/lister/gitlab/tests/conftest.py
deleted file mode 100644
--- a/swh/lister/gitlab/tests/conftest.py
+++ /dev/null
@@ -1,6 +0,0 @@
-# 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
-
-from swh.lister.core.tests.conftest import *  # noqa
diff --git a/swh/lister/gnu/tests/conftest.py b/swh/lister/gnu/tests/conftest.py
deleted file mode 100644
--- a/swh/lister/gnu/tests/conftest.py
+++ /dev/null
@@ -1,6 +0,0 @@
-# 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
-
-from swh.lister.core.tests.conftest import *  # noqa
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
@@ -3,7 +3,6 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from swh.lister.core.tests.conftest import *  # noqa
 from datetime import datetime
 import json
 import os
diff --git a/swh/lister/npm/tests/conftest.py b/swh/lister/npm/tests/conftest.py
--- a/swh/lister/npm/tests/conftest.py
+++ b/swh/lister/npm/tests/conftest.py
@@ -1,12 +1,10 @@
-# Copyright (C) 2019  The Software Heritage developers
+# 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
 
-from swh.lister.core.tests.conftest import *  # noqa
-
 
 @pytest.fixture
 def lister_npm(swh_listers):
diff --git a/swh/lister/packagist/tests/conftest.py b/swh/lister/packagist/tests/conftest.py
--- a/swh/lister/packagist/tests/conftest.py
+++ b/swh/lister/packagist/tests/conftest.py
@@ -1,12 +1,10 @@
-# Copyright (C) 2019  The Software Heritage developers
+# 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
 
-from swh.lister.core.tests.conftest import *  # noqa
-
 
 @pytest.fixture
 def lister_packagist(swh_listers):
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
@@ -1,12 +1,10 @@
-# Copyright (C) 2019  The Software Heritage developers
+# 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
 
-from swh.lister.core.tests.conftest import *  # noqa
-
 
 @pytest.fixture
 def lister_phabricator(swh_listers):
diff --git a/swh/lister/pypi/tests/conftest.py b/swh/lister/pypi/tests/conftest.py
--- a/swh/lister/pypi/tests/conftest.py
+++ b/swh/lister/pypi/tests/conftest.py
@@ -1,12 +1,10 @@
-# Copyright (C) 2019  The Software Heritage developers
+# 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
 
-from swh.lister.core.tests.conftest import *  # noqa
-
 
 @pytest.fixture
 def lister_pypi(swh_listers):
diff --git a/swh/lister/core/tests/conftest.py b/swh/lister/pytest_plugin.py
rename from swh/lister/core/tests/conftest.py
rename to swh/lister/pytest_plugin.py
--- a/swh/lister/core/tests/conftest.py
+++ b/swh/lister/pytest_plugin.py
@@ -4,6 +4,7 @@
 # See top-level LICENSE file for more information
 
 import logging
+
 import pytest
 
 from sqlalchemy import create_engine
@@ -11,6 +12,7 @@
 from swh.lister import get_lister, SUPPORTED_LISTERS
 from swh.lister.core.models import initialize
 
+
 logger = logging.getLogger(__name__)