Fix #303 -- valid until date for payment providers (#334)

* Fix 303

* fix #303

* minor refactoring

* improving timezone aware

* added documentation

src/tests/base/test_payment.py

@@ -1,6 +1,8 @@
+import datetime
 from decimal import Decimal
 
 import pytest
+import pytz
 from django.utils.timezone import now
 from tests.testdummy.payment import DummyPaymentProvider
 
@@ -50,3 +52,32 @@ def test_payment_fee_reverse_percent_and_abs_default(event):
     prov.settings.set('_fee_abs', Decimal('0.30'))
     prov.settings.set('_fee_percent', Decimal('2.90'))
     assert prov.calculate_fee(Decimal('100.00')) == Decimal('3.30')
+
+
+@pytest.mark.django_db
+def test_availability_date_available(event):
+    prov = DummyPaymentProvider(event)
+    prov.settings.set('_availability_date', datetime.date.today() + datetime.timedelta(days=1))
+    result = prov._is_still_available()
+    assert result
+
+
+@pytest.mark.django_db
+def test_availability_date_not_available(event):
+    prov = DummyPaymentProvider(event)
+    prov.settings.set('_availability_date', datetime.date.today() - datetime.timedelta(days=1))
+    result = prov._is_still_available()
+    assert not result
+
+
+@pytest.mark.django_db
+def test_availability_date_timezones(event):
+    event.settings.set('timezone', 'US/Pacific')
+    prov = DummyPaymentProvider(event)
+    prov.settings.set('_availability_date', '2016-12-01')
+
+    tz = pytz.timezone('US/Pacific')
+    utc = pytz.timezone('UTC')
+    assert prov._is_still_available(tz.localize(datetime.datetime(2016, 11, 30, 23, 0, 0)).astimezone(utc))
+    assert prov._is_still_available(tz.localize(datetime.datetime(2016, 12, 1, 23, 59, 0)).astimezone(utc))
+    assert not prov._is_still_available(tz.localize(datetime.datetime(2016, 12, 2, 0, 0, 1)).astimezone(utc))