has testdir => (
        traits => ['DirOption'],
        isa => 'Str',
        is => 'rw',
        rootdir => '/home/paulatreides',
    );

##</code><code>##

    has testdir => (
        traits => [ 'DirOption' => { rootdir => '/home/paulatreides' } ],
        isa => 'Str',
        is => 'rw',
    );