簡単なモックのサンプル

SimpleMock.php

<?php

class SimpleMock
{
    public $returnValue = array();

    public function __call($method, $args)
    {
        if (isset($this->returnValue[$method])) {
            return $this->returnValue[$method];
        }
        return null;
    }

    public function setReturnValue($method, $val)
    {
        $this->returnValue[$method] = $val;
    }

}

$m = new SimpleMock();
var_dump($m->walk());
$m->setReturnValue('walk', 'walking!');
var_dump($m->walk());