Fixed #132 -- Reverse payment fee calculation

src/tests/testdummy/payment.py

@@ -0,0 +1,19 @@
+import logging
+
+from pretix.base.payment import BasePaymentProvider
+
+logger = logging.getLogger('tests.testdummy.ticketoutput')
+
+
+class DummyPaymentProvider(BasePaymentProvider):
+    identifier = 'testdummy'
+    verbose_name = 'Test dummy'
+
+    def order_pending_render(self, request, order) -> str:
+        pass
+
+    def payment_is_valid_session(self, request) -> bool:
+        pass
+
+    def checkout_confirm_render(self, request) -> str:
+        pass

src/tests/testdummy/signals.py

@@ -1,9 +1,17 @@
 from django.dispatch import receiver
 
-from pretix.base.signals import register_ticket_outputs
+from pretix.base.signals import (
+    register_payment_providers, register_ticket_outputs,
+)
 
 
 @receiver(register_ticket_outputs, dispatch_uid="output_dummy")
 def register_ticket_outputs(sender, **kwargs):
     from .ticketoutput import DummyTicketOutput
     return DummyTicketOutput
+
+
+@receiver(register_payment_providers, dispatch_uid="payment_dummy")
+def register_ticket_outputs(sender, **kwargs):
+    from .payment import DummyPaymentProvider
+    return DummyPaymentProvider