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Open the app on a document, make a change, then quit (Command-Q). If it doesn't ask if you want to save the document, then it has Autosave. Now restart the application. If the document reappears, it has Resume as well.

Most apps with Autosave will also have a Duplicate menu item instead of a Save-As, however that isn't always true. I've got the "Lionized" EazyDraw app and it has both Duplicate and Save-As.
 
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