def test_file_disappearing(self):

       dest = self.dest1

       source = self.source 

       source.ensure("ex").write("a" * 100)

       source.ensure("ex2").write("a" * 100)

       class DRsync(RSync):

           def filter(self, x):

               assert x != source

               if x.endswith("ex2"):

                   self.x = 1

                   source.join("ex2").remove()

               return True

->     rsync = DRsync(source)

       rsync.add_target(gw, dest)

       rsync.send()

       assert rsync.x == 1

       assert len(dest.listdir()) == 1

       assert len(source.listdir()) == 1