title: Whats the right place for testhelper-classes? (phpunit/best practise)
body: <p>I want to test my application with PHPUnit. So I have my application-classes and a second tree with test-classes as usual. Now I need for some test a kind of Dummy/Mock-Objects and I want to know where I should place them. Is it a different usecase and it should be place in common lib folder or what is to prefer? </p>