The present invention relates to a method of testing an application program mounted on a smart device 10 such as a smart phone, a tablet computer or the like, in which a test target application program is automatically tested by a control program installed in the smart device 10, and an effective permission is granted to the control program through a booster 20 combined with the smart device 10. Through the present invention, a test can be automatically conducted without handling a corresponding smart device 10, in which an application program test is conducted, by the user of the smart device 10, and a test on the application program under a variety of conditions can be conducted efficiently and systematically.