Scripted testing and exploratory testing are widely adopted among developers. It is known that exploratory testing can detect bugs more efficiently than scripted testing. However, exploratory testing has the problem that it is difficult to agree with third parties on test results and test quality. In this study, we propose a novel testing approach to facilitate efficient testing and quality assurance. Furthermore, we propose a tool that records the details of testing activity and visualizes them in multiple ways. Our approach realizes both high efficiency like exploratory testing and high auditability like scripted testing. We interviewed 14 developers about our approach to refine it and make it practical. We describe how we reflected the feedback from the interview in our approach.