How to unit test business rules?

Posted by Robert Lamb on Stack Overflow See other posts from Stack Overflow or by Robert Lamb
Published on 2009-06-19T02:56:31Z Indexed on 2010/04/06 16:13 UTC
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unit-testing

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business-rules

I need a unit test to make sure I am accumulating vacation hours properly. But vacation hours accumulate according to a business rule, if the rule changes, then the unit test breaks.

Is this acceptable? Should I expose the rule through a method and then call that method from both my code and my test to ensure that the unit test isn't so fragile?

My question is: What is the right way to unit test business rules that may change?

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