diff --git a/cotisations/test_models.py b/cotisations/test_models.py
index c0f8c463..8c582ceb 100644
--- a/cotisations/test_models.py
+++ b/cotisations/test_models.py
@@ -100,35 +100,6 @@ class VenteModelTests(TestCase):
         self.assertEqual(end_memb.month, expected_end.month)
         self.assertEqual(end_memb.year, expected_end.year)
 
-    def test_date_start_cotisation(self):
-        """
-        It should be possible to add a cotisation with a specific start date
-        """
-        v = Vente(
-            facture=self.f,
-            number=1,
-            name="Test purchase",
-            duration_connection=0,
-            duration_days_connection=1,
-            duration_membership=0,
-            duration_days_membership=1,
-            prix=0,
-        )
-        v.save()
-        v.create_cotis(
-            date_start_con=timezone.make_aware(datetime.datetime(1998, 10, 16)),
-            date_start_memb=timezone.make_aware(datetime.datetime(1998, 10, 16)),
-        )
-        v.save()
-        self.assertEqual(
-            v.cotisation.date_end_con,
-            timezone.make_aware(datetime.datetime(1998, 10, 17)),
-        )
-        self.assertEqual(
-            v.cotisation.date_end_memb,
-            timezone.make_aware(datetime.datetime(1998, 10, 17)),
-        )
-
     def test_one_day_cotisation_membership_only(self):
         """
         It should be possible to have one day membership without connection.
@@ -215,35 +186,6 @@ class VenteModelTests(TestCase):
         self.assertEqual(end_memb.month, expected_end.month)
         self.assertEqual(end_memb.year, expected_end.year)
 
-    def test_date_start_cotisation_membership_only(self):
-        """
-        It should be possible to add a cotisation with a specific start date
-        """
-        v = Vente(
-            facture=self.f,
-            number=1,
-            name="Test purchase",
-            duration_connection=0,
-            duration_days_connection=0,
-            duration_membership=0,
-            duration_days_membership=1,
-            prix=0,
-        )
-        v.save()
-        v.create_cotis(
-            date_start_con=timezone.make_aware(datetime.datetime(1998, 10, 16)),
-            date_start_memb=timezone.make_aware(datetime.datetime(1998, 10, 16)),
-        )
-        v.save()
-        self.assertEqual(
-            v.cotisation.date_end_con,
-            timezone.make_aware(datetime.datetime(1998, 10, 17)),
-        )
-        self.assertEqual(
-            v.cotisation.date_end_memb,
-            timezone.make_aware(datetime.datetime(1998, 10, 16)),
-        )
-
     def test_cotisation_membership_diff_connection(self):
         """
         It should be possible to have purchase a membership longer