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
@@ -6,12 +6,9 @@
 import os
 
 import pytest
-from pytest_postgresql.janitor import DatabaseJanitor
-from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 
 from swh.core.db.pytest_plugin import postgresql_fact
-from swh.lister.core.models import SQLBase
 
 from swh.lister.debian import debian_init
 import swh.scheduler
@@ -48,7 +45,7 @@
         {
             "type": "load-deb-package",
             "description": "Load a Debian package",
-            "backend_name": "swh.loader.debian.tasks.LoaderDebianPackage",
+            "backend_name": "swh.loader.packages.debian.tasks.LoaderDebianPackage",
             "default_interval": "1 day",
         }
     )
@@ -57,24 +54,8 @@
 
 
 @pytest.fixture
-def sqlalchemy_engine(postgresql_proc):
-    pg_host = postgresql_proc.host
-    pg_port = postgresql_proc.port
-    pg_user = postgresql_proc.user
-
-    pg_db = "sqlalchemy-tests"
-
-    url = f"postgresql://{pg_user}@{pg_host}:{pg_port}/{pg_db}"
-    with DatabaseJanitor(pg_user, pg_host, pg_port, pg_db, postgresql_proc.version):
-        engine = create_engine(url)
-        yield engine
-        engine.dispose()
-
-
-@pytest.fixture
-def session(sqlalchemy_engine):
-    SQLBase.metadata.create_all(sqlalchemy_engine)
-    Session = sessionmaker(bind=sqlalchemy_engine)
-    session = Session()
+def session(lister_db_url, engine):
+    session = sessionmaker(bind=engine)()
     yield session
     session.close()
+    engine.dispose()
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
@@ -9,14 +9,12 @@
 from unittest.mock import patch
 
 import pytest
-from sqlalchemy.engine import create_engine
 
 from swh.lister import get_lister
-from swh.lister.core.models import initialize
 
 
 @pytest.fixture
-def lister_launchpad(datadir, lister_db_url, swh_scheduler):
+def lister_launchpad(datadir, lister_db_url, engine, swh_scheduler):
     class Collection:
         entries = []
 
@@ -42,11 +40,8 @@
     with patch("launchpadlib.launchpad.Launchpad.login_anonymously"):
         lister = get_lister("launchpad", db_url=lister_db_url)
 
-    lister.scheduler = swh_scheduler  # inject scheduler fixture
     lister.launchpad.git_repositories.getRepositories.side_effect = [
         mock_lp_response(i) for i in range(3)
     ]
 
-    initialize(create_engine(lister_db_url), drop_tables=True)
-
     return lister
diff --git a/swh/lister/pytest_plugin.py b/swh/lister/pytest_plugin.py
--- a/swh/lister/pytest_plugin.py
+++ b/swh/lister/pytest_plugin.py
@@ -50,9 +50,13 @@
 
 
 @pytest.fixture
-def swh_lister(lister_db_url, swh_scheduler, lister_under_test, swh_config):
-    assert lister_under_test in SUPPORTED_LISTERS
-    lister = get_lister(lister_under_test, db_url=lister_db_url)
-    initialize(create_engine(lister_db_url), drop_tables=True)
+def engine(lister_db_url):
+    engine = create_engine(lister_db_url)
+    initialize(engine, drop_tables=True)
+    return engine
+
 
-    return lister
+@pytest.fixture
+def swh_lister(engine, lister_db_url, lister_under_test, swh_config):
+    assert lister_under_test in SUPPORTED_LISTERS
+    return get_lister(lister_under_test, db_url=lister_db_url)