call site 1 for path.local.sysexec
path/local/testing/test_local.py - line 238
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   def test_sysexec(self):
       x = py.path.local.sysfind('ls') 
->     out = x.sysexec('-a')
       for x in py.path.local().listdir(): 
           assert out.find(x.basename) != -1