testo-mutation-testing

Mutation testing improves test coverage by deliberately introducing faults into your code and running your test suite to detect escaped mutants. If tests pass despite the fault, it exposes gaps in your test coverage that need strengthening.

To run mutation testing on your Testo project, execute the `testo-mutation-testing run` command. This initiates Infection to systematically introduce faults, identify escaped mutants, and generate a comprehensive report of killed and not-covered mutants.

Yes, you can define the scope of mutation testing to run on the whole project or break it down into specific segments. This allows you to efficiently target particular areas of your codebase or simply generate a coverage report.

Yes, you need both Testo and Infection installed, along with a Testo project configured with the appropriate setup. These dependencies are required to execute the mutation testing process and identify escaped mutants effectively.

The best way to kill escaped mutants is by adding new tests or strengthening existing ones. This Skill guides you through the process of reviewing the mutation report and writing targeted tests to catch the faults that previously escaped detection.

Mutation testing reports show not-covered mutants because traditional code coverage only checks if code is executed. Mutation testing goes deeper by introducing faults, revealing that while code is run, your tests may lack the assertions needed to catch escaped mutants.