call site 17 for execnet.PopenGateway.__init__
execnet/testing/test_gateway.py - line 501
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   def test_threads():
->     gw = py.execnet.PopenGateway()
       gw.remote_init_threads(3)
       c1 = gw.remote_exec("channel.send(channel.receive())")
       c2 = gw.remote_exec("channel.send(channel.receive())")
       c2.send(1)
       res = c2.receive()
       assert res == 1
       c1.send(42)
       res = c1.receive()
       assert res == 42
       gw.exit()