sqlite sorts with null differently than postgres

smash/web/tests/api_views/test_subject.py

@@ -576,6 +576,9 @@ class TestSubjectApi(LoggedInWithWorkerTestCase):
         appointment.status = Appointment.APPOINTMENT_STATUS_FINISHED
         appointment.save()
 
+        visit = create_visit(subject2, datetime_begin=get_today_midnight_date() + datetime.timedelta(days=31),
+                             datetime_end=get_today_midnight_date() + datetime.timedelta(days=61))
+
         self.check_subject_ordered("visit_1", [subject, subject2])
 
     def test_invalid_order(self):
@@ -585,7 +588,11 @@ class TestSubjectApi(LoggedInWithWorkerTestCase):
         subject = self.study_subject
         subject2 = create_study_subject(2)
 
-        create_contact_attempt(subject=subject)
+        contact_attempt = create_contact_attempt(subject=subject2)
+        contact_attempt.datetime_when = datetime.datetime(1900, 1, 1)
+        contact_attempt.save()
+
+        create_contact_attempt(subject=subject2)
 
         self.check_subject_ordered("last_contact_attempt", [subject, subject2])