call site 6 for process.cmdexec
process/testing/test_cmdexec.py - line 20
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   def test_err(self):
       try:
->         cmdexec('echoqweqwe123 hallo')
           raise AssertionError, "command succeeded but shouldn't"
       except cmdexec.Error, e:
           assert hasattr(e, 'err')
           assert hasattr(e, 'out')
           assert e.err or e.out