Mocking the Filesystem during BDD with Behat and PHPSpec - www.slashnode.com

Config.php

<?php

class Config
{
    protected $settings; 

    public function __construct($settings = array())
    {
        $this->settings = $settings;
    }

    public static function load($path)
    {
        $config = new static();

        if (file_exists($path))
            return new static(include $path);

        return new static;
    }

    public function get($key, $default = null)
    {
        if (isset($this->settings[$key]))
            return $this->settings[$key];
        return $default;
    }

    public function set($key, $value)
    {
        $this->settings[$key] = $value;
    }
}