Codeception: How to skip tests according to environment.

gistfile1.php

<?php
namespace Codeception\Module;

class WebHelper extends \Codeception\Module
{
    // skip tests for PHP 5.3
    public function _before(\Codeception\TestCase $test) {
        if (floatval(phpversion()) == '5.3') $test->markTestSkipped();
    }
}