old_contents: from django.test import TestCase
  from django_ajax.response import JSONResponse
  
  class ResponseTestCase(TestCase):
      def test_json_response(self):
          data = {'test': True}
          response = JSONResponse(data)
  
          self.assertEquals(response.status_code, 200)
          self.assertEquals(response['Content-Type'], 'application/json')
          self.assertEquals(response.content, '{"test": true}')
  
new_contents: from __future__ import unicode_literals
  from django.test import TestCase
  from django_ajax.response import JSONResponse
  
  class ResponseTestCase(TestCase):
      def test_json_response(self):
          data = {'test': True}
          response = JSONResponse(data)
  
          self.assertEquals(200, response.status_code)
          self.assertEquals('application/json', response['Content-Type'])
          self.assertEquals('{"test": true}', response.content)
  
subject: Fix tests