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As you do at the end of every recipe, build and run the application to test what you’ve created.
You already know that you can open a new diary window, change it, save it, close it, open it, change it again, save it again, or even save another version of it. You should try everything else you can normally do with documents, to satisfy yourself that it is working correctly. Choose File > Revert to Saved after making some changes to a saved document. Use the Open Recent menu item in the File menu. Use the Undo and Redo menu items in the Edit menu. Almost everything works.