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Why bother with PHPUnit?

DrDamnit asked
Last Modified: 2016-01-30
Loaded question, I know. But, we recently started to implement PHPUnit with our new projects, and while it's neat to write the tests, they ALWAYS pass because I am testing how objects are instantiated or used in a vacuum. I am sure this is not the sum total of PHPUnit's abilities, and perhaps my answer is using mock objects. But, what I really want to test with PHPUnit is "What happens when a user violates the norms during the course of use? What will break?" i.e., what happens when a user acts like... a user?

Of course I need to ensure that when we instantiate a class of "Customer" the getBalance() method returns a number not null, and not a string. But there has to be more to it than that.

Can anyone give a short narrative on how they use PHPUnit to test more than: "Is this class written properly"?
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