public function testSingleField()
{
$this->specify('The Digit Validator does not validate correctly', function () {
$validation = new Validation();
$validation->add('amount', new Digit());
$messages = $validation->validate(['amount' => '123']);
expect($messages->count())->equals(0);
$messages = $validation->validate(['amount' => '123abc']);
expect($messages->count())->equals(1);
});
}