I recently completed a personal OpenGL game project, and have several testers lined up to assist me with the alpha and beta phases of testing. Unfortunately, none of them have macs with retina displays (nor do I), and I unfortunately have no way of knowing if rendering issues will arise (such as fonts and user interface elements, or the whole window, being rendered at incorrect sizes) when the game runs on retina macs. Because retina macs make up a large portion of my target audience, I need to identify some way to gain access to a machine to test it myself, or to find volunteers willing to do it for me. I imagine Apple store personnel would not take kindly to me walking in there with a USB stick and a foreign program. Any ideas on where I could find volunteers with appropriate hardware willing to assist with such a project? Would it be inappropriate for me to make such a request here?