Today?s business climate requires you to constantly evolve IT strategies responding to new opportunities or threats. While the fundamentals of IT - reliability, availability, security and manageability - are still crucial, rapid results are mandatory for business success. These business challenges can be solved by acting with agility - striking the proper balance between the introduction of leading-edge technology and the pragmatic application of IT. In this paper, we introduce a testing framework for business solutions dealing with complex and dynamic IT environments. Our framework supports test-driven development which facilitates an incremental construction of reliable business solutions that can be adapted to changes of a business environment easily. We compare our testing framework with model-driven development approaches and show how we applied our framework to an event-driven process management platform called SARI (Sense And Respond Infrastructure).