Abstract
Mutation testing is one of the most effective techniques to evaluate the quality of a test suites. Due to its tasks and its costs, a tool to automate and reduce costs of mutation testing is required, in order to perform mutation analyses. Bacterio is a Java mutation testing tool that automates the tasks to perform mutation analyses and that implements a set of mutation techniques that reduce the costs of mutation and the execution mutant time drastically. Thus, this tool helps testers to evaluate the quality of their tests, keeping mutation cheap and fast.