Add support for custom taxation rules

src/tests/presale/test_checkout.py

@@ -1,4 +1,5 @@
 import datetime
+import json
 import os
 from datetime import timedelta
 from decimal import Decimal
@@ -415,6 +416,51 @@ class CheckoutTestCase(TestCase):
         ia = InvoiceAddress.objects.get(pk=self.client.session['carts'][self.session_key].get('invoice_address'))
         assert not ia.vat_id_validated
 
+    def test_custom_tax_rules(self):
+        self.tr19.custom_rules = json.dumps([
+            {'country': 'AT', 'address_type': '', 'action': 'vat'},
+            {'country': 'ZZ', 'address_type': '', 'action': 'reverse'},
+        ])
+        self.tr19.save()
+        self.event.settings.invoice_address_vatid = True
+
+        cr1 = CartPosition.objects.create(
+            event=self.event, cart_id=self.session_key, item=self.ticket,
+            price=23, expires=now() + timedelta(minutes=10)
+        )
+
+        with mock.patch('vat_moss.id.validate') as mock_validate:
+            mock_validate.return_value = ('AT', 'AT123456', 'Foo')
+            self.client.post('/%s/%s/checkout/questions/' % (self.orga.slug, self.event.slug), {
+                'is_business': 'business',
+                'company': 'Foo',
+                'name': 'Bar',
+                'street': 'Baz',
+                'zipcode': '12345',
+                'city': 'Here',
+                'country': 'AT',
+                'vat_id': 'AT123456',
+                'email': 'admin@localhost'
+            }, follow=True)
+
+        cr1.refresh_from_db()
+        assert cr1.price == Decimal('23.00')
+
+        self.client.post('/%s/%s/checkout/questions/' % (self.orga.slug, self.event.slug), {
+            'is_business': 'business',
+            'company': 'Foo',
+            'name': 'Bar',
+            'street': 'Baz',
+            'zipcode': '12345',
+            'city': 'Here',
+            'country': 'DE',
+            'vat_id': 'DE123456',
+            'email': 'admin@localhost'
+        }, follow=True)
+
+        cr1.refresh_from_db()
+        assert cr1.price == Decimal('19.33')
+
     def test_question_file_upload(self):
         q1 = Question.objects.create(
             event=self.event, question='Student ID', type=Question.TYPE_FILE,