Clean up import ordering

tests/test_testing.py

-# -- coding: utf-8 --
-
+# encoding: utf-8
 from __future__ import unicode_literals
 from django.conf.urls import patterns, url
-from io import BytesIO
-
 from django.contrib.auth.models import User
 from django.shortcuts import redirect
 from django.test import TestCase
 from rest_framework.decorators import api_view
 from rest_framework.response import Response
 from rest_framework.test import APIClient, APIRequestFactory, force_authenticate
+from io import BytesIO
 
 
 @api_view(['GET', 'POST'])