public function testSanitizeCustomIpv4FilterIP()
{
$this->specify("custom filter does not return correct IP", function () {
$filter = new Filter();
$filter->add('ipv4', new IPv4());
$expected = '127.0.0.1';
$actual = $filter->sanitize('127.0.0.1', 'ipv4');
expect($actual)->equals($expected);
});
}