Scrum does not 'handle' testing. Scrum specifies "potentially shippable product" every 30 days. Scrum is a lightweight framework that empowers the ScrumMaster, the delivery team and the Product Owner with specific responsibilities to create a quality product that meets user/customer needs. What does that mean, exactly? It means that YOU handle testing. It means that YOUR TEAM has to figure out a way to get to "potentially shippable product" in a very short timeframe. Most teams figure out early on that the traditional approaches to testing must change in order to respond to the pressure of Scrum. This is why many teams choose to adopt the engineering practices of Extreme Programming (XP), such as continuous integration, test driven development, test automation, et al.