fix(api): add basic booking throttling

backend/checkins/test_api.py

@@ -1,13 +1,16 @@
 from datetime import timedelta
+from unittest.mock import patch
 
 from django.contrib.auth import get_user_model
 from django.urls import reverse
+from django.test.utils import override_settings
 from django.utils import timezone
 from rest_framework import status
 from rest_framework.test import APITestCase
 
 from bookings.models import Reservation, ReservationToken
 from checkins.models import CheckIn
+from checkins.views import CheckInPreviewThrottle
 from shows.models import Performance, Show, Venue
 
 
@@ -105,6 +108,28 @@ class CheckInApiTests(APITestCase):
         self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
         self.assertEqual(response.data["status"], "invalid_token")
 
+    def test_preview_is_throttled_for_staff_user(self):
+        with patch.dict(CheckInPreviewThrottle.THROTTLE_RATES, {"check_in_preview": "1/minute"}, clear=False):
+            first_reservation = self.create_reservation(email="first@example.com")
+            _, first_raw_token = self.create_check_in_token(first_reservation)
+            second_reservation = self.create_reservation(email="second@example.com")
+            _, second_raw_token = self.create_check_in_token(second_reservation)
+            self.client.force_authenticate(user=self.staff_user)
+
+            first_response = self.client.post(
+                reverse("api-check-in-preview"),
+                {"token": first_raw_token},
+                format="json",
+            )
+            second_response = self.client.post(
+                reverse("api-check-in-preview"),
+                {"token": second_raw_token},
+                format="json",
+            )
+
+        self.assertEqual(first_response.status_code, status.HTTP_200_OK)
+        self.assertEqual(second_response.status_code, status.HTTP_429_TOO_MANY_REQUESTS)
+
     def test_check_in_success_as_staff_user(self):
         reservation = self.create_reservation()
         _, raw_token = self.create_check_in_token(reservation)