[IMP] account_payment_order: test performance improvement

- Create setUpClass method
- Switch to setUpClass (if needed) for avoiding repeat the same setup for each test.
- Include context keys for avoiding mail operations overhead.

account_payment_order/tests/test_bank.py

@@ -4,8 +4,15 @@
 from odoo.exceptions import ValidationError
 from odoo.tests.common import TransactionCase
 
+from odoo.addons.base.tests.common import DISABLED_MAIL_CONTEXT
+
 
 class TestBank(TransactionCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.env = cls.env(context=dict(cls.env.context, **DISABLED_MAIL_CONTEXT))
+
     def test_bank(self):
         bank = self.env["res.bank"].search([], limit=1)
         self.assertTrue(bank)

account_payment_order/tests/test_payment_mode.py

@@ -18,7 +18,6 @@ class TestPaymentMode(TransactionCase):
             AccountPaymentMethod._get_payment_method_information
         )
 
-        @classmethod
         def _get_payment_method_information(cls):
             res = Method_get_payment_method_information(cls)
             res["IN"] = {"mode": "multi", "domain": [("type", "=", "bank")]}