[RED] Add download_query test for JadwalDonor model

backend/donor/test_models.py

+from datetime import datetime, timedelta
 from django.test import TestCase
+from django.utils import timezone
+from django.core.exceptions import ValidationError
+
 from main.factories import UserFactory
 from donor.models import JadwalDonor
 from donor.factories import JadwalDonorFactory, DaftarDonorFactory
-from datetime import datetime
-from django.core.exceptions import ValidationError
 
 
 class JadwalDonorTest(TestCase):
@@ -26,6 +28,19 @@ class JadwalDonorTest(TestCase):
                 time_end=datetime.fromisoformat(time_end), quota=150, category=JadwalDonor.Category.PRIVATE
             )
 
+    def test_download_query(self):
+        user1 = UserFactory(email='donald@duckduckgo.org')
+        user1.save()
+        user2 = UserFactory(email='daisy@duckduckgo.org')
+        user2.save()
+        jadwal_donor = JadwalDonorFactory(time_start=timezone.localtime() - timedelta(hours=24),
+                                          time_end=timezone.localtime() - timedelta(hours=23))
+        DaftarDonorFactory(user=user1, jadwal_donor=jadwal_donor, has_attended=True)
+        DaftarDonorFactory(user=user2, jadwal_donor=jadwal_donor, has_attended=True)
+
+        qs = JadwalDonor.download_query([jadwal_donor.id])
+
+        self.assertEqual(len(qs), 2)
 
 class DaftarDonorTest(TestCase):