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