test(backend): add tests to check functions of stats computing

.gitlab-ci.yml

@@ -67,7 +67,7 @@ test_back:
     - make setup
   script:
     - cd backend
-    - pytest base_app/ backend_app/ --cov --cov-config .coveragerc --cov-report term --cov-report html
+    - pytest base_app/ backend_app/ stats_app/ --cov --cov-config .coveragerc --cov-report term --cov-report html
   artifacts:
     paths:
       - backend/htmlcov/

Makefile

@@ -28,7 +28,7 @@ reformat_backend:
 	docker-compose exec backend sh -c "cd backend && black ."
 
 test_backend:
-	docker-compose exec backend sh -c "cd backend && pytest --cov --cov-config .coveragerc --cov-report term   base_app/ backend_app/"
+	docker-compose exec backend sh -c "cd backend && pytest --cov --cov-config .coveragerc --cov-report term base_app/ backend_app/ stats_app/"
 
 test_frontend:
 	docker-compose exec frontend sh -c "cd frontend && yarn test"

backend/stats_app/tests/test_nb_connections.py

+from datetime import timedelta
+
+from django.test import TestCase
+
+from base_app.models import User
+from stats_app.compute_stats import update_all_stats
+from stats_app.models import DailyConnections
+from stats_app.utils import get_daily_connections, get_today_as_datetime
+
+
+class StatsConnectionsTest(TestCase):
+    def test_get_daily_connections(self):
+        today = get_today_as_datetime()
+        yesterday = today - timedelta(days=1)
+        for i in range(10):
+            User.objects.update_or_create(
+                username=f"{i}", defaults=dict(last_login=yesterday)
+            )
+
+        daily_connections = get_daily_connections()
+        self.assertEqual(daily_connections, 10)
+
+        two_days_ago = today - timedelta(days=2)
+        for i in range(10, 20):
+            User.objects.update_or_create(
+                username=f"{i}", defaults=dict(last_login=two_days_ago)
+            )
+
+        daily_connections = get_daily_connections()
+        self.assertEqual(daily_connections, 10)
+
+    def test_update_all_stats(self):
+        today = get_today_as_datetime()
+        yesterday = today - timedelta(days=1)
+        for i in range(10):
+            User.objects.update_or_create(
+                username=f"{i}", defaults=dict(last_login=yesterday)
+            )
+
+        update_all_stats()
+
+        yesterday_daily_connections = DailyConnections.objects.get(date=yesterday)
+
+        self.assertEqual(yesterday_daily_connections.nb_connections, 10)