As you probably know, since NAV 2009, there is some kind of framework built in the C/SIDE environment that can deal with application testing. Usually referred to as “Testing Framework” or “Test codeunits” or “Test Toolset” or “probably-some-kind-of-other-description-I-don’t-think-of-at-this-moment-but-deals-with-testing-the-functionality-of-your-(customized)-NAV-solution”.