Mockoko - yet another PHPUnit mocking shortcut

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<?php

/**
 * Yet another PHPUnit wrapper for mocking
 *
 * To enable, just add the following line in your base testcase:
 *
 *  Mockoko::getInstance()->setTestCase($this);
 *
 * To use, just make your mocks as
 *
 *  mock('Symfony\Component\Security\Core\SecurityContext', array(
 *    'getToken' => mock('Symfony\Component\Security\Core\Authentication\Token\TokenInterface', array(
 *      'getUser' => new User()
 *    ))
 *  ));
 */
class Mockoko
{
    /** @var Mockoko */
    static private $instance;

    /** @var \PHPUnit_Framework_TestCase */
    private $testCase;

    /** @return Mockoko */
    static public function getInstance()
    {
        return empty(self::$instance)
            ? self::$instance = new static()
            : self::$instance;
    }

    public function setTestCase(\PHPUnit_Framework_TestCase $tc)
    {
        $this->testCase = $tc;
    }

    public function mock($className, array $methodStubs)
    {
        $mock = $this->testCase->getMock($className);
        foreach ($methodStubs as $methodName => $returnValue) {
            $mock->expects($this->testCase->any())->method($methodName)
                ->will($this->testCase->returnValue($returnValue));
        }

        return $mock;
    }
}

function mock($className, array $methodStubs)
{
    return Mockoko::getInstance()->mock($className, $methodStubs);
}