spec\PHPSpec2\Formatter\Presenter\Differ\Differ::it_should_choose_proper_engine PHP Метод

    function it_should_choose_proper_engine($engine1, $engine2)
    {
        $engine1->supports('string1', 'string2')->willReturn(true);
        $engine2->supports('string1', 'string2')->willReturn(false);
        $engine1->compare('string1', 'string2')->willReturn('string1 !== string2');
        $engine1->supports(2, 1)->willReturn(false);
        $engine2->supports(2, 1)->willReturn(true);
        $engine2->compare(2, 1)->willReturn('2 !== 1');
        $this->addEngine($engine1);
        $this->addEngine($engine2);
        $this->compare('string1', 'string2')->shouldReturn('string1 !== string2');
        $this->compare(2, 1)->shouldReturn('2 !== 1');
    }