test(time-entries): cover grouped filters and serializer formatting

apps/time_entries/tests/test_serializers.py

@@ -0,0 +1,29 @@
+from datetime import datetime
+
+from django.utils import timezone
+
+from apps.time_entries.api.serializers import TimeEntrySerializer
+from apps.time_entries.models import TimeEntry
+from apps.users.models import User
+from apps.workspaces.models import Workspace
+
+
+def test_time_entry_serializer_keeps_seconds(db):
+    user = User.objects.create_user(mobile="09123333333", password="secret123")
+    workspace = Workspace.objects.create(name="Core", owner=user)
+    current_timezone = timezone.get_current_timezone()
+
+    start_time = timezone.make_aware(datetime(2026, 4, 23, 10, 15, 42), current_timezone)
+    end_time = timezone.make_aware(datetime(2026, 4, 23, 11, 0, 5), current_timezone)
+
+    entry = TimeEntry.objects.create(
+        workspace=workspace,
+        user=user,
+        start_time=start_time,
+        end_time=end_time,
+    )
+
+    data = TimeEntrySerializer(entry).data
+
+    assert data["start_time"] == start_time.strftime("%Y-%m-%d %H:%M:%S")
+    assert data["end_time"] == end_time.strftime("%Y-%m-%d %H:%M:%S")