A small test harness that verifies Rector keeps working alongside other tools in the PHP static-analysis ecosystem.

It runs a minimal real-world setup — a custom Rector rule, a custom PHPStan rule, and a PHPUnit test suite — against multiple combinations of dependencies in CI, to catch breakage early.

• A custom Rector rule (MakeClassFinalRector, UseGetArgRector) loads and applies correctly.
• A custom PHPStan rule (CustomPHPStanRule) loads and runs alongside Rector.
• PHPUnit 10, 11, and 12 all work with Rector's preloaded dependencies.
• Manually including nikic/php-parser in user code does not conflict with the copy Rector ships.
• rector-laravel + nikic/php-parser upgrade scenarios run cleanly (see rectorphp/rector#9470).

This project lives inside rector/rector-src (under compat-tests/) and pulls in rector/rector:dev-main as a downstream dependency, so the compat suite is maintained in one place. It mirrors the standalone rectorphp/rector-compat-tests.

GitHub Actions runs the matrix daily (0 6 * * *) and on every push/PR, from the repository root .github/workflows:

• compat_test.yaml — Rector dev + PHPUnit 10 / 11 / 12
• rector_laravel_rector_dev.yaml — Rector + rector-laravel + php-parser