The paper presents an overview of the results of 5 years of research in the field of self-testing. In 2007, self-testing was defined as one direction of smart technologies, a common idea of which is the desire to fit software with features of living beings: abilities to adapt to changing external environment, to optimize themselves and to defend themselves against threats. The purpose of self-testing is to provide a possibility to verify that the software is working correctly at any point of its life cycle. The research was carried out in several stages: at first, the concept and functionality of self-testing and its applicability in various software operating environments were defined; it was followed by implementing the self-testing functionality by integrating testing support options into the software developed. After that, the self-testing concept was compared against the possibilities offered by traditional testing support tools and implemented in an actual banking information system, and the efficiency of self-testing options was evaluated. The final conclusions drawn are: self-testing offers a number of advantages in achieving the software quality at comparatively low costs, at the same time ensuring the same functionality as provided by conventional testing support tools.