One of the key roles of any information system is to enforce the business rules and policies set by the owning organisation. As for any important functionality, it is necessary to verify the implementation of any business rule carefully, through thorough testing. However, business rules have some specific features which make testing a particular challenge. They represent a more fine-grained unit of functionality than is usually considered by testing tools (programs, module, UML models, etc.) and their implementations are typically spread across a system (or perhaps some specific layer of a system). There is no convenient one-toone relationship between programs and business rules that can facilitate their testing. To the best of our knowledge, no tools, methods or guidelines exist for helping software developers to test the implementation of business rules. Standard testing tools can help to a certain extent, but they leave the rule-specific work entirely in the programmer’s hand...
David Willmor, Suzanne M. Embury