Fix not refunding the total amount by default

Fixes jazzband#401

payments/models.py

@@ -299,9 +299,9 @@ def refund(self, amount=None):
                 raise ValueError(
                     "Refund amount can not be greater then captured amount"
                 )
-            provider = provider_factory(self.variant, self)
-            amount = provider.refund(self, amount)
-            self.captured_amount -= amount
+        provider = provider_factory(self.variant, self)
+        amount = provider.refund(self, amount)
+        self.captured_amount -= amount
         if self.captured_amount == 0 and self.status != PaymentStatus.REFUNDED:
             self.change_status(PaymentStatus.REFUNDED)
         self.save()

payments/test_core.py

@@ -111,20 +111,18 @@ def test_refund_too_high_amount(self):
 
     @patch("payments.dummy.DummyProvider.refund")
     def test_refund_without_amount(self, mocked_refund_method):
-        refund_amount = None
+        captured_amount = Decimal("200")
         with patch.object(BasePayment, "save") as mocked_save_method:
             mocked_save_method.return_value = None
-            mocked_refund_method.return_value = refund_amount
+            mocked_refund_method.return_value = captured_amount
 
-            captured_amount = Decimal("200")
-            status = PaymentStatus.CONFIRMED
             payment = Payment(
-                variant="default", status=status, captured_amount=captured_amount
+                variant="default", status=PaymentStatus.CONFIRMED, captured_amount=captured_amount
             )
-            payment.refund(refund_amount)
-            self.assertEqual(payment.status, status)
-            self.assertEqual(payment.captured_amount, captured_amount)
-        self.assertEqual(mocked_refund_method.call_count, 0)
+            payment.refund()
+            self.assertEqual(payment.status, PaymentStatus.REFUNDED)
+            self.assertEqual(payment.captured_amount, Decimal(0))
+        self.assertEqual(mocked_refund_method.call_count, 1)
 
     @patch("payments.dummy.DummyProvider.refund")
     def test_refund_partial_success(self, mocked_refund_method):