Do not crash when the scanned card is not associated with any account

src/foobar/tests/test_views.py

@@ -1,19 +1,50 @@
-from django.test import TestCase
-from wallet.tests.factories import WalletFactory, WalletTrxFactory
-from wallet.enums import TrxType
+from unittest import mock
 from moneyed import Money
 from django.contrib.auth.models import User
+from django.test import TestCase
 from django.urls import reverse
-from unittest import mock
+from wallet.tests.factories import WalletFactory, WalletTrxFactory
+from wallet.enums import TrxType
+from . import factories
 
 
 class FoobarViewTest(TestCase):
+    TESTUSER_NAME = 'the_baconator'
+    TESTUSER_PASS = '123'
+
+    def setUp(self):
+        self.user = User.objects.create_superuser(
+            self.TESTUSER_NAME,
+            '[email protected]',
+            self.TESTUSER_PASS
+        )
+        self.client.login(
+            username=self.TESTUSER_NAME,
+            password=self.TESTUSER_PASS
+        )
+
+    @mock.patch('foobar.api.get_account')
+    def test_account_for_card(self, mock_get_account):
+        url = reverse('account_for_card', kwargs={'card_id': 1337})
+        mock_get_account.return_value = None
+        response = self.client.get(url, follow=True)
+        self.assertRedirects(
+            response,
+            reverse('admin:foobar_account_changelist')
+        )
+        self.assertEqual(len(response.context['messages']), 1)
+        account = factories.AccountFactory()
+        mock_get_account.return_value = account
+        response = self.client.get(url, follow=True)
+        self.assertRedirects(
+            response,
+            reverse('admin:foobar_account_change', args=(account.id,))
+        )
+        self.assertEqual(len(response.context['messages']), 0)
+
     @mock.patch('foobar.api.calculate_correction')
     @mock.patch('foobar.api.make_deposit_or_withdrawal')
     def test_wallet_management(self, mock_deposit_withdrawal, mock_correction):
-        user = User.objects.create_superuser(
-            'the_baconator', '[email protected]', '123'
-        )
         wallet_obj = WalletFactory.create()
         WalletTrxFactory.create(
             wallet=wallet_obj,
@@ -23,7 +54,6 @@ def test_wallet_management(self, mock_deposit_withdrawal, mock_correction):
         url = reverse('wallet_management',
                       kwargs={'obj_id': wallet_obj.owner_id})
         cl = self.client
-        cl.login(username='the_baconator', password='123')
         # Test that deposit or withdrawal
         # is not called if balance will get negative
         response = cl.post(url,
@@ -44,7 +74,7 @@ def test_wallet_management(self, mock_deposit_withdrawal, mock_correction):
                             'balance_0': ['1000']})
         mock_correction.assert_called_with(Money(1000, 'SEK'),
                                            wallet_obj.owner_id,
-                                           user,
+                                           self.user,
                                            'test')
         # Test that deposit or withdrawal form post is correct and
         # calls fucnction with correct params
@@ -56,5 +86,5 @@ def test_wallet_management(self, mock_deposit_withdrawal, mock_correction):
         mock_deposit_withdrawal.assert_called_with(
             Money(100, 'SEK'),
             wallet_obj.owner_id,
-            user,
+            self.user,
             'test')

src/foobar/views.py

@@ -1,6 +1,7 @@
 from django.contrib.auth.decorators import permission_required
 from django.contrib.admin.views.decorators import staff_member_required
 from django.shortcuts import redirect
+from django.utils.translation import ugettext_lazy as _
 from . import api
 from django.shortcuts import render
 from .forms import CorrectionForm, DepositForm
@@ -13,6 +14,10 @@
 @permission_required('foobar.change_account')
 def account_for_card(request, card_id):
     account_obj = api.get_account(card_id)
+    if account_obj is None:
+        messages.add_message(request, messages.ERROR,
+                             _('No account has been found for given card.'))
+        return redirect('admin:foobar_account_changelist')
     return redirect('admin:foobar_account_change', account_obj.id)