#!perl
use strict;
use warnings FATAL => 'all';
use Test::More;
{
    package Stuff;
    use Test::More;
    use Test::Fatal;
    use Function::Parameters qw(:strict);
    method whatever($this) {
        return $this;
    }
    is( Stuff->whatever(23),    23 );
    like exception { Stuff->whatever() }, qr/Too few arguments/;
    method some_optional($that, $this = 22) {
        return $that + $this
    }
    is( Stuff->some_optional(18), 18 + 22 );
    like exception { Stuff->some_optional() }, qr/Too few arguments/;
}
done_testing();