This paper presents a comprehensive analysis of the integration process of statistical methodology for testing the system using tools like MaTeLo in Black-Box Testing system for automated testing. Through the specific example of testing a digital TV receiver, all the steps in testing process are analyzed: creation of device's operational profile (i.e. usage model) with the emphasis on determining the probability of transitions between states, automatic test case generation, test execution, and the analysis of results obtained by the MaTeLo tool.