test_unbounded_response: to_unicode → custom six code

tests/test_crawl.py

@@ -1,6 +1,7 @@
 import json
 import logging
 
+import six
 from testfixtures import LogCapture
 from twisted.internet import defer
 from twisted.trial.unittest import TestCase
@@ -161,7 +162,11 @@ with multiples lines
         crawler = self.runner.create_crawler(SimpleSpider)
         with LogCapture() as l:
             yield crawler.crawl(self.mockserver.url("/raw?{0}".format(query)), mockserver=self.mockserver)
-        self.assertEqual(to_unicode(l).count("Got response 200"), 1)
+        if six.PY2:
+            message = unicode(l)
+        else:
+            message = str(l)
+        self.assertEqual(message.count("Got response 200"), 1)
 
     @defer.inlineCallbacks
     def test_retry_conn_lost(self):