Retrieving Previous Mac OS X Versions for Testing

I am porting some code to OSX and need some copies of older versions of OSX. Does Mac Developer provide the ability to download previous versions of OSX? Several forums mention this, but I found conflicting / old information about this. It doesn't seem to be here:

https://developer.apple.com/downloads/index.action

I also know about this post. Does the Mac developer program have older versions of Mac OS X? but now she is 3 years old. I know that some versions can be purchased on Amazon - most likely, it will not go along this route if there is no need. What is the general way to test OSX applications for backward compatibility?

Thanks!

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