parser.error() reports a nice error message, that also displays a short reminder of the available options. Adapt the test-suite accordingly: previously, the error string was an exact string in the stdout list, while it now is a substring in one of the strings in stderr. The exit code changes, too. Signed-off-by: Yann E. MORIN <yann.morin@orange.com> Cc: Julien Olivain <ju.o@free.fr> Signed-off-by: Julien Olivain <ju.o@free.fr>