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Testing with JUnit by Frank Appel

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Choosing the next functionality to test

Now that you know how to structure a test properly, you still might feel a bit insecure about what to test, where to start, how to continue, and how to know when you are done. What follows will be a few heuristics to help you in mastering these hurdles.

Start with the happy path

Meszaros defines the happy path as the normal path of execution through a use case or the software that implements it; also known as the sunny day scenario. Nothing goes wrong, nothing out of the ordinary happens, and we swiftly and directly achieve the user's or caller's goal, [MESZ07]. Regarding the addition of an item to our timeline functionality, the happy path is made up of an item that gets sorted into a list of existing items, ...

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