Rename tixl to pretix

src/pretixplugins/testdummy/signals.py

@@ -0,0 +1,9 @@
+from django.dispatch import receiver
+
+from pretixbase.signals import determine_availability
+
+
+@receiver(determine_availability)
+def availability_handler(sender, **kwargs):
+    kwargs['sender'] = sender
+    return kwargs