Mutation Testing with PHP
summary
Mutation testing for PHP is demonstrated using the Infection PHP tool on a shipping calculator example; it generates mutants (flipping conditionals, changing signatures) to show that 66% line coverage can still hide a low mutation score (~15%). The workflow runs in CI with GitHub Actions and the concrete approach is to add targeted tests that kill surviving mutants, raise the mutation score, and produce actionable diffs to improve test confidence.
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chapters (8)
- 0:00Introduction
- 1:04What is mutation testing
- 2:31How mutation testing works
- 3:56Measuring test effectiveness
- 7:28Practical demo: shipping calculator
- 12:35Fixing failing mutants
- 14:23Starting mutation testing
- 17:32Resources and next steps
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