PHP mutation testing example

This repo demonstrates how to perform mutation testing with Infection in PHP.

The example class implements a game of War

The main branch contains the working mutation testing example with 100% code coverage and 100% mutation score index (MSI).

The coverage-only branch has 100% code coverage and 40% MSI, demonstrating the importance of mutation testing.

The errors branch has code that will cause timeouts and syntax errors in mutation tests.