call site 8 for execnet.RSync.send
execnet/testing/test_rsync.py - line 128
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   def test_callback(self):
       dest = self.dest1
       source = self.source
       source.ensure("existant").write("a" * 100)
       source.ensure("existant2").write("a" * 10)
       total = {}
       def callback(cmd, lgt, channel):
           total[(cmd, lgt)] = True
   
       rsync = RSync(source, callback=callback)
       #rsync = RSync()
       rsync.add_target(gw, dest)
->     rsync.send()
   
       assert total == {("list", 110):True, ("ack", 100):True, ("ack", 10):True}