Made the test timezone aware, DateTimeFiled(auto_now_add) already was.

lostplaces/lostplaces_app/admin.py

@@ -13,8 +13,8 @@ from lostplaces_app.forms import ExplorerCreationForm, ExplorerChangeForm
 # Register your models here.
 
 class VoucherAdmin(admin.ModelAdmin):
-    fields = ['code', 'expires', 'created']
-    readonly_fields = ['created']
+    fields = ['code', 'expires_when', 'created_when']
+    readonly_fields = ['created_when']
 
 admin.site.register(Explorer)
 admin.site.register(Voucher, VoucherAdmin)

lostplaces/lostplaces_app/models.py

@@ -54,11 +54,11 @@ class Voucher(models.Model):
     """
 
     code = models.CharField(unique=True, max_length=30)
-    created = models.DateTimeField(auto_now_add=True)
-    expires = models.DateField()
+    created_when = models.DateTimeField(auto_now_add=True)
+    expires_when = models.DateTimeField()
 
     def __str__(self):
-        return "Voucher " + str(self.pk)
+        return "Voucher " + str(self.code)
 
 
 class Place (models.Model):

lostplaces/lostplaces_app/tests/models/test_voucher_model.py

@@ -2,6 +2,7 @@ import datetime
 
 from django.test import TestCase
 from django.db import models
+from django.utils import timezone
 
 from lostplaces_app.models import Voucher
 from lostplaces_app.tests.models import ModelTestCase
@@ -10,11 +11,11 @@ from lostplaces_app.tests.models import ModelTestCase
 def mock_voucher():
     return Voucher.objects.create(
         code='ayDraJCCwfhcFiYmSR5GrcjcchDfcahv',
-        expires=datetime.datetime.now() + datetime.timedelta(days=1)
+        expires_when=timezone.now() + datetime.timedelta(days=1)
     )
 
 
-class VoucheTestCase(ModelTestCase, TestCase):
+class VoucherTestCase(ModelTestCase, TestCase):
     model_name = 'Voucher'
 
     def setUp(self):
@@ -48,4 +49,4 @@ class VoucheTestCase(ModelTestCase, TestCase):
             msg='Expecting %s.__str__ to contain the voucher code' % (
                 self.model_name
             )
-        )
+        )