refacto(backend): refacto test so that they work with refactored computing functions

backend/stats_app/tests/test_nb_connections.py

@@ -17,7 +17,7 @@ class StatsConnectionsTest(TestCase):
                 username=f"{i}", defaults=dict(last_login=yesterday)
             )
 
-        daily_connections = get_daily_connections()
+        daily_connections = get_daily_connections(yesterday)
         self.assertEqual(daily_connections, 10)
 
         two_days_ago = today - timedelta(days=2)
@@ -26,7 +26,7 @@ class StatsConnectionsTest(TestCase):
                 username=f"{i}", defaults=dict(last_login=two_days_ago)
             )
 
-        daily_connections = get_daily_connections()
+        daily_connections = get_daily_connections(yesterday)
         self.assertEqual(daily_connections, 10)
 
     def test_update_daily_connections(self):

backend/stats_app/tests/test_nb_contributions.py

@@ -13,8 +13,8 @@ from stats_app.utils import get_today_as_datetime, get_contributions_profiles
 class StatsContributionsTest(TestCase):
     @classmethod
     def setUpTestData(cls):
-        today = get_today_as_datetime()
-        yesterday = today - timedelta(days=1)
+        cls.today = get_today_as_datetime()
+        cls.yesterday = cls.today - timedelta(days=1)
 
         cls.univ = get_dummy_university()
         utc_partner_id = cls.univ.corresponding_utc_partners.all()[0].utc_id
@@ -40,12 +40,12 @@ class StatsContributionsTest(TestCase):
             ExchangeFeedback.objects.update_or_create(
                 exchange=exchange,
                 defaults=dict(
-                    updated_on=yesterday, untouched=False, university=cls.univ
+                    updated_on=cls.yesterday, untouched=False, university=cls.univ
                 ),
             )
 
     def test_get_contributions_profiles(self):
-        daily_contributions_profiles = get_contributions_profiles()
+        daily_contributions_profiles = get_contributions_profiles(self.yesterday)
         self.assertEqual(len(daily_contributions_profiles), 2)
         for p in daily_contributions_profiles:
             self.assertEqual(p.major, "IM")
@@ -54,11 +54,11 @@ class StatsContributionsTest(TestCase):
             self.assertEqual(p.university_pk, self.univ.pk)
 
     def test_update_daily_exchange_contributions_info(self):
-        today = get_today_as_datetime()
-        yesterday = today - timedelta(days=1)
         update_daily_exchange_contributions_info()
 
-        contributions = DailyExchangeContributionsInfo.objects.filter(date=yesterday)
+        contributions = DailyExchangeContributionsInfo.objects.filter(
+            date=self.yesterday
+        )
 
         self.assertEqual(len(contributions), 1)
         contribution: DailyExchangeContributionsInfo = contributions[0]