Use six.xrange in tests.

greentest/six.py

 import sys
-from gevent.hub import PY3
+
+PY3 = sys.version_info[0] >= 3
 
 if PY3:
     advance_iterator = next
@@ -18,6 +19,7 @@ if PY3:
 
     print_ = getattr(builtins, "print")
     del builtins
+    xrange = range
 
 else:
     def exec_(code, globs=None, locs=None):
@@ -31,3 +33,5 @@ else:
         elif locs is None:
             locs = globs
         exec("""exec code in globs, locs""")
+
+    xrange = xrange

greentest/test__backdoor.py

@@ -2,6 +2,7 @@ import greentest
 import gevent
 from gevent import socket
 from gevent import backdoor
+from six import xrange
 
 
 def read_until(conn, postfix):

greentest/test__event.py

 import greentest
 import gevent
 from gevent.event import Event, AsyncResult
+from six import xrange
 
 DELAY = 0.01
 

greentest/test__order.py

 import gevent
 import greentest
+from six import xrange
 
 
 class appender(object):

greentest/test__socket_dns.py

@@ -8,6 +8,7 @@ from time import time
 import gevent
 import gevent.socket as gevent_socket
 from util import log
+from six import xrange
 
 
 resolver = gevent.get_hub().resolver

greentest/test__subprocess_interrupted.py

 import sys
+from six import xrange
 
 
 if 'runtestcase' in sys.argv[1:]:

greentest/test_close_backend_fd.py

 import os
 import gevent
 from gevent import core
+from six import xrange
 
 
 for count in xrange(2):

greentest/test_hub_join_timeout.py

@@ -3,6 +3,7 @@ from contextlib import contextmanager
 import gevent
 from gevent.event import Event
 from time import time
+from six import xrange
 
 
 SMALL = 0.1

greentest/test_queue.py

@@ -7,6 +7,7 @@ import threading
 import time
 import unittest
 import test_support
+from six import xrange
 
 QUEUE_SIZE = 5
 

greentest/test_threading_2.py

 # testing gevent's Event, Lock, RLock, Semaphore, BoundedSemaphore with standard test_threading
 from __future__ import with_statement
+from six import xrange
 
 setup_ = '''from gevent import monkey; monkey.patch_all()
 from gevent.event import Event