use Test::More tests => 3; package MyVal; use Validation::Class; package main; my $r = MyVal->new( fields => { foobar => { max_length => 5 } }, params => { foobar => 'apple' } ); ok $r->validate(), 'foobar validates'; $r->fields->{foobar}->{max_length} = 4; ok ! $r->validate(), 'foobar doesnt validate'; ok 'foobar can\'t contain more than 4 characters' eq $r->errors_to_string(), 'displays proper error message'; #warn $r->errors_to_string();