public function testShouldValidateAvailableUniqueness()
{
$uniquenessOptions = ['table' => 'users', 'column' => 'login'];
$uniqueness = new Uniqueness($uniquenessOptions, $this->getDbStub());
$this->validation->add('login', $uniqueness);
$messages = $this->validation->validate(['login' => 'login_free']);
$this->assertCount(0, $messages);
}