  
  import pytest
  from django.contrib.auth.models import User
  from django.core.cache import cache
  from django.test import TestCase
  
  from rest_framework.response import Response
  from rest_framework.settings import api_settings
  from rest_framework.test import APIRequestFactory
 
</s> remove     BaseThrottle, ScopedRateThrottle, UserRateThrottle
 </s> add     BaseThrottle, ScopedRateThrottle, SimpleRateThrottle, UserRateThrottle
from django.core.exceptions import ImproperlyConfigured
  
  import pytest
  from django.contrib.auth.models import User
  from django.core.cache import cache
from django.core.exceptions import ImproperlyConfigured
  from django.test import TestCase
  
  from rest_framework.response import Response
  from rest_framework.settings import api_settings
  from rest_framework.test import APIRequestFactory
keep keep keep add keep keep keep keep keep
 Add couple of basic tests for SimpleRateThrottle (#4800) 
tests/test_throttling.py