diff --git a/report_xlsx_helper/tests/test_report_xlsx_helper.py b/report_xlsx_helper/tests/test_report_xlsx_helper.py
index 25c384edb..b1af4ffa2 100644
--- a/report_xlsx_helper/tests/test_report_xlsx_helper.py
+++ b/report_xlsx_helper/tests/test_report_xlsx_helper.py
@@ -7,20 +7,31 @@ from odoo.tests.common import TransactionCase
 
 
 class TestReportXlsxHelper(TransactionCase):
-    def setUp(self):
-        super(TestReportXlsxHelper, self).setUp()
+    @classmethod
+    def setUpClass(cls):
+        super(TestReportXlsxHelper, cls).setUpClass()
+        # Remove this variable in v16 and put instead:
+        # from odoo.addons.base.tests.common import DISABLED_MAIL_CONTEXT
+        DISABLED_MAIL_CONTEXT = {
+            "tracking_disable": True,
+            "mail_create_nolog": True,
+            "mail_create_nosubscribe": True,
+            "mail_notrack": True,
+            "no_reset_password": True,
+        }
+        cls.env = cls.env(context=dict(cls.env.context, **DISABLED_MAIL_CONTEXT))
         today = date.today()
-        p1 = self.env.ref("base.res_partner_1")
-        p2 = self.env.ref("base.res_partner_2")
+        p1 = cls.env.ref("base.res_partner_1")
+        p2 = cls.env.ref("base.res_partner_2")
         p1.date = today
         p2.date = today
-        self.partners = p1 + p2
+        cls.partners = p1 + p2
         ctx = {
             "report_name": "report_xlsx_helper.test_partner_xlsx",
             "active_model": "res.partner",
-            "active_ids": self.partners.ids,
+            "active_ids": cls.partners.ids,
         }
-        self.report = self.env["ir.actions.report"].with_context(**ctx)
+        cls.report = cls.env["ir.actions.report"].with_context(**ctx)
 
     def test_report_xlsx_helper(self):
         report_xls = self.report._render_xlsx(None, None)