call site 8 for execnet.Channel.waitclose
execnet/testing/test_gateway.py - line 310
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   def test_remote_exec_redirect_multi(self): 
       num = 3
       l = [[] for x in range(num)]
       channels = [self.gw.remote_exec("print %d" % i, 
                                       stdout=l[i].append)
                       for i in range(num)]
       for x in channels: 
->         x.waitclose(TESTTIMEOUT) 
   
       for i in range(num): 
           subl = l[i] 
           assert subl 
           s = subl[0]
           assert s.strip() == str(i)