diff --git a/setup.py b/setup.py
index ccb3beac4d..83edcaa12f 100755
--- a/setup.py
+++ b/setup.py
@@ -138,6 +138,7 @@ setup(name=name,
     install_requires=requires,
     extras_require={
         'BCrypt': ['bcrypt'],
+        'test': tests_require,
         'html2text': ['html2text'],
         },
     dependency_links=dependency_links,
@@ -146,7 +147,4 @@ setup(name=name,
     [trytond.modules]
     web_user = trytond.modules.web_user
     """,
-    test_suite='tests',
-    test_loader='trytond.test_loader:Loader',
-    tests_require=tests_require,
     )
diff --git a/tests/__init__.py b/tests/__init__.py
index 6c97729254..4effdfa4a2 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,9 +1,2 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-
-try:
-    from trytond.modules.web_user.tests.test_web_user import suite
-except ImportError:
-    from .test_web_user import suite
-
-__all__ = ['suite']
diff --git a/tests/test_web_user.py b/tests/test_module.py
similarity index 95%
rename from tests/test_web_user.py
rename to tests/test_module.py
index 374c2a722d..bf0530e5a6 100644
--- a/tests/test_web_user.py
+++ b/tests/test_module.py
@@ -1,16 +1,13 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 
-import unittest
 from unittest.mock import ANY, patch
 
 from trytond.config import config
 from trytond.modules.party.tests import PartyCheckEraseMixin
 from trytond.modules.web_user import user as user_module
 from trytond.pool import Pool
-from trytond.tests.test_tryton import ModuleTestCase
-from trytond.tests.test_tryton import suite as test_suite
-from trytond.tests.test_tryton import with_transaction
+from trytond.tests.test_tryton import ModuleTestCase, with_transaction
 
 VALIDATION_URL = 'http://www.example.com/validation'
 RESET_PASSWORD_URL = 'http://www.example.com/reset_password'
@@ -200,8 +197,4 @@ class WebUserTestCase(PartyCheckEraseMixin, ModuleTestCase):
         self.assertEqual(auth_user, user)
 
 
-def suite():
-    suite = test_suite()
-    suite.addTests(unittest.TestLoader().loadTestsFromTestCase(
-            WebUserTestCase))
-    return suite
+del ModuleTestCase
diff --git a/tox.ini b/tox.ini
index 8275dd04fd..b171674be4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,8 +2,9 @@
 envlist = {py37,py38,py39,py310}-{sqlite,postgresql}
 
 [testenv]
+extras = test
 commands =
-    coverage run --include=.*/web_user/* setup.py test
+    coverage run --include=.*/web_user/* -m unittest discover -s tests
     coverage report --include=.*/web_user/* --omit=*/tests/*
 deps =
     coverage