public void Element_ChangeOfElementPropertiesAfterAddingToCommandTree_ThrowsException()
{
RootCommand cmd = MPOptions.GetRoot();
Option opt = new Option("mike", "t1", false);
Argument arg=new Argument("arg");
cmd.Add(opt).Add(arg);
AssertHelper.Throws<InvalidOperationException>(() => opt.WithStaticValidator("foo","bar"));
AssertHelper.Throws<InvalidOperationException>(() => arg.WithNoValidator());
}