X-MuT: a tool for the generation of XSLT mutants

Mutation testing has been historically applied to many programming languages as a white box testing technique. In this paper, we propose a set of mutation operator classes for XSLT language, and we implement them into a tool called X-MuT. The tool automatically generates the set of mutants and provides facilities to run a given test suite on the mutants and to compute the test suite effectiveness in terms of mutation score. We provide an example of X-MuT application to evaluate the effectiveness of an existing test suite for a XSLT stylesheet transforming the standard MARCXML to the Dublin Core format.