The paper is dedicated to principles of smart technologies as well as advantages and restrictions for usage of them. Self-testing as a feature of smart technologies is analyzed more closely. Self-testing is carried out using complete test cases and a built-in test execution mechanism (self-testing mode). The self-testing feature enables testing of software during the whole life cycle and especially in the maintenance phase since this feature operates in both testing and productive environments. The paper also contains an experience-based report about economical aspects of usage of smart technologies and especially self-testing.