I'm curious how others approach testing Mac Apps on earlier versions of Mac OS X.I was hoping to run Yosemite in a Virtual Machine to make installing and testing my app easy. But it seems difficult to find a copy of the Yosemite installer anywhere, unless you'd downloaded it from the App Store. Unfortunately for me, Yosemite came pre-installed on my Mac.Am I missing something> Is there a better way to test on older systems?