mutest-rs: Flexible, efficient mutation analysis tool for rust programs, using extensive static analysis

Determining the adequacy of software tests, and where testing gaps might lie, is crucial for improving and maintaining the strength of test suites. Mutation analysis facilitates this by evaluating tests against generated program faults; however, no mature mutation analysis tooling exists for the safety-focused Rust systems programming language, to date. This paper introduces mutest-rs, a mature, end-to-end mutation analysis tool for Rust programs that is based on extensive static program analysis, and integrates directly with the rustc Rust compiler. Our tool overcomes the numerous challenges of generating valid Rust code mutants, and does so efficiently through a Rustspecific meta-mutant approach. Our open-source tool, mutest-rs, is available online at https://mutest.rs. A video demonstrating mutest-rs is available at https://youtu.be/8yEYAU6P63I.