use Test::More tests => 1;

# load module
package MyVal; use Validation::Class;  package main;

my $v = MyVal->new(
    fields => {
        foobar => {
            filters => 'lowercase'
        }
    },
    params => {
        foobar => '123ABC456DEF'
    }
);

ok $v->params->{foobar} =~ /^123abc456def$/, 'lowercase filter working as expected';