Embodiments of the invention relate to maintaining a repository of subroutines used by a software program under test based on an analysis of subroutine usage logs. One aspect of the invention concerns a method that comprises analyzing a log of subroutine usage by an application under test to identify subroutines used by the application based on actions in the subroutines, and comparing the identified subroutines against a repository of subroutines applicable to the application. The method may further designate a subroutine in the repository as a matching subroutine, modify or delete a subroutine, or add a new subroutine to the repository.