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You’ve been testing the Vermont Recipes application at the end of every recipe and, in many cases, at the end of individual steps. But you ought to do more testing.
During development, you can use unit testing. I have not covered unit tests in this book. Read the Xcode Unit Testing Guide and Test Driving Your Code with OCUnit for more information. Near the end of the development cycle, run the release build with the Console open so that you can catch non-fatal errors that might have gone undetected until now.