We present Yogi, a tool that checks properties of C programs by combining static analysis and testing. Yogi implements the Dash algorithm which performs verification by combining directed testing and abstraction. We have engineered Yogi in such a way that it plugs into Microsoft’s Static Driver Verifier framework. We have used this framework to run Yogi on 69 Windows Vista drivers with 85 properties. We find that the new algorithm enables Yogi to scale much better than Slam, which is the current engine driving Microsoft’s Static Driver Verifier.