ParameterMatch<OptionDescriptor> helpMatch = match.getParameter(optionDesc);
assertNotNull(helpMatch);
CommandInvoker<Instance<b>, ?> invoker = match.getInvoker();
Help help = (Help)invoker.invoke(Util.wrap(new b()));
assertNotNull(help);
CommandDescriptor mainDescriptor = help.getDescriptor();
assertEquals("b", mainDescriptor.getName());
assertSame(null, mainDescriptor.getOwner());
}