call site 9 for path.local.chdir
execnet/testing/test_gateway.py - line 406
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   def test_chdir_separation(self):
->     old = py.test.ensuretemp('chdirtest').chdir()
       try:
           gw = py.execnet.PopenGateway()
       finally:
           waschangedir = old.chdir()
       c = gw.remote_exec("import os ; channel.send(os.getcwd())")
       x = c.receive()
       assert x == str(waschangedir)