Mutation Test Runner

Overview

Execute mutation testing to evaluate the effectiveness of a test suite by systematically introducing small code changes (mutants) and checking whether existing tests detect them. A killed mutant means the tests caught the change; a surviving mutant reveals a testing gap.

Prerequisites

• Mutation testing framework installed (Stryker, mutmut, PITest, or go-mutesting)
• Existing test suite with reasonable pass rate (all tests must pass before mutation testing)
• Source code with functions and logic suitable for mutation (conditionals, arithmetic, return values)
• Sufficient CI resources (mutation testing runs the test suite once per mutant -- CPU-intensive)
• Configuration file for the mutation tool specifying target files and test commands

Instructions

1. Verify the existing test suite passes completely:
   • Run the full test suite and confirm 100% pass rate.
   • Fix any failing or skipped tests before proceeding.
   • Mutation testing is meaningless if the baseline tests are broken.