diff --git a/setup.py b/setup.py
index 24f75f7ec3..ca390fec5e 100755
--- a/setup.py
+++ b/setup.py
@@ -142,6 +142,4 @@ setup(name=name,
     [trytond.modules]
     product_price_list = trytond.modules.product_price_list
     """,
-    test_suite='tests',
-    test_loader='trytond.test_loader:Loader',
     )
diff --git a/tests/__init__.py b/tests/__init__.py
index 32beb877c7..4effdfa4a2 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,10 +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.product_price_list.tests.test_product_price_list import \
-        suite  # noqa: E501
-except ImportError:
-    from .test_product_price_list import suite
-
-__all__ = ['suite']
diff --git a/tests/test_product_price_list.py b/tests/test_module.py
similarity index 97%
rename from tests/test_product_price_list.py
rename to tests/test_module.py
index ca94d76d6e..5b2ccc7585 100644
--- a/tests/test_product_price_list.py
+++ b/tests/test_module.py
@@ -1,9 +1,8 @@
 # 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 decimal import Decimal
 
-import trytond.tests.test_tryton
 from trytond.modules.company.tests import (
     CompanyTestMixin, create_company, set_company)
 from trytond.pool import Pool
@@ -234,8 +233,4 @@ class ProductPriceListTestCase(CompanyTestMixin, ModuleTestCase):
                 None)
 
 
-def suite():
-    suite = trytond.tests.test_tryton.suite()
-    suite.addTests(unittest.TestLoader().loadTestsFromTestCase(
-        ProductPriceListTestCase))
-    return suite
+del ModuleTestCase
diff --git a/tox.ini b/tox.ini
index 870a3cea5e..509cdb0058 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ envlist = {py37,py38,py39,py310}-{sqlite,postgresql}
 
 [testenv]
 commands =
-    coverage run --include=.*/product_price_list/* setup.py test
+    coverage run --include=.*/product_price_list/* -m unittest discover -s tests
     coverage report --include=.*/product_price_list/* --omit=*/tests/*
 deps =
     coverage