kfet -- Add test to check the choices of checkouts in K-Psul

Particularly, it adds a regression test for #184.

kfet/tests/test_forms.py

@@ -0,0 +1,48 @@
+import datetime
+from unittest import mock
+
+from django.test import TestCase
+from django.utils import timezone
+
+from kfet.forms import KPsulCheckoutForm
+from kfet.models import Checkout
+
+from .utils import create_user
+
+
+class KPsulCheckoutFormTests(TestCase):
+
+    def setUp(self):
+        self.now = timezone.now()
+
+        user = create_user()
+
+        self.c1 = Checkout.objects.create(
+            name='C1', balance=10,
+            created_by=user.profile.account_kfet,
+            valid_from=self.now,
+            valid_to=self.now + datetime.timedelta(days=1),
+        )
+
+        self.form = KPsulCheckoutForm()
+
+    def test_checkout(self):
+        checkout_f = self.form.fields['checkout']
+        self.assertListEqual(list(checkout_f.choices), [
+            ('', '---------'),
+            (self.c1.pk, 'C1'),
+        ])
+
+    @mock.patch('django.utils.timezone.now')
+    def test_checkout_valid(self, mock_now):
+        """
+        Checkout are filtered using the current datetime.
+        Regression test for #184.
+        """
+        self.now += datetime.timedelta(days=2)
+        mock_now.return_value = self.now
+
+        form = KPsulCheckoutForm()
+
+        checkout_f = form.fields['checkout']
+        self.assertListEqual(list(checkout_f.choices), [('', '---------')])