Fix payments backend tests

payments/tests/bitcoin.py

@@ -38,7 +38,7 @@ class BitcoinBackendTest(TestCase):
         self.user = User.objects.create_user('test', 'test_user@example.com', None)
 
         self.p = Payment.objects.create(
-            user=self.user, time=timedelta(days=30), backend='bitcoin',
+            user=self.user, time=timedelta(days=30), backend_id='bitcoin',
             amount=300)
 
     def test_new(self):
@@ -77,7 +77,7 @@ class BitcoinBackendConfirmTest(TestCase):
         self.user = User.objects.create_user('test', 'test_user@example.com', None)
 
         self.p = Payment.objects.create(
-            user=self.user, time=timedelta(days=30), backend='bitcoin',
+            user=self.user, time=timedelta(days=30), backend_id='bitcoin',
             amount=300)
 
         # call new_payment

payments/tests/paypal.py

@@ -138,7 +138,7 @@ class PaypalBackendTest(TestCase):
         payment = Payment.objects.create(
             user=self.user,
             time=timedelta(days=30),
-            backend='paypal',
+            backend_id='paypal',
             amount=300
         )
 
@@ -191,7 +191,7 @@ class PaypalBackendTest(TestCase):
         payment = Payment.objects.create(
             user=self.user,
             time=timedelta(days=30),
-            backend='paypal',
+            backend_id='paypal',
             amount=300
         )
 
@@ -230,7 +230,7 @@ class PaypalBackendTest(TestCase):
     def test_paypal_subscr(self):
         subscription = Subscription.objects.create(
             user=self.user,
-            backend='paypal',
+            backend_id='paypal',
             period='3m'
         )
 

payments/tests/stripe.py

@@ -15,7 +15,7 @@ class StripeBackendTest(TestCase):
         payment = Payment.objects.create(
             user=self.user,
             time=timedelta(days=30),
-            backend='stripe',
+            backend_id='stripe',
             amount=300
         )