[FIX] payment: test with correct currency rates

Following the standardization of the demo data in
https://github.com/odoo/odoo/commit/3752b3166ec6bbb5c6ea55f96bb521381bf2b2d9,
some bugs remained in case the currency of the company was changed.

closes odoo/odoo#108943

Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/payment/tests/test_payment_provider.py

@@ -104,6 +104,11 @@ class TestPaymentProvider(PaymentCommon):
 
     def test_fees_with_currency_conversion(self):
         """ Test that the conversion of the fees is correctly computed. """
+        # Some modules change the company settings and may make this test useless.
+        if self.currency_euro == self.provider.main_currency_id or (
+            self.country_france == self.provider.company_id.country_id
+        ):
+            return
         self.provider.write({
             'fees_active': True,
             'fees_dom_fixed': 0.,
@@ -114,7 +119,7 @@ class TestPaymentProvider(PaymentCommon):
 
         with patch(
             'odoo.addons.base.models.res_currency.Currency._get_rates',
-            return_value={self.currency_euro.id: 2., self.currency_usd.id: 1.},
+            return_value={self.currency_euro.id: 2., self.provider.main_currency_id.id: 1.},
         ):
             transaction_fees = self.currency.round(
                 self.provider._compute_fees(self.amount, self.currency_euro, self.country_france)