PhakeClass.php

<?php

class PhakeClass
{
    public function __call($method, $args)
    {
        return '__call';
    }
}

PhakeClassTest.php

<?php

require_once 'Phake.php';
require_once 'PhakeClass.php';

class PhakeClassTest extends PHPUnit_Framework_TestCase
{
    public function testMockingOfMagicCallMethod()
    {
        $expected = 'magicCalled';
        $obj = Phake::Mock('PhakeClass');
        Phake::when($obj)->magicCall()->thenReturn($expected);

        $value = $obj->magicCall();
        $this->assertEquals($expected, $value);
    }
}