Because SP1 for Microsoft Dynamics NAV 2009 was released, I tried to create short demo of the new functionality, which allows developers to create tests for their code. Official documentation for this part of NAV 2009 SP1 could be found here . How it works You have new property on codeunit – Subtype – which could be “Normal,Test,TestRunner”. Normal – you know it… ;-) Test – this codeunit have functions, which are testing the functionality, this is the main codeunit doing the testing TestRunner...