PHP Diff Test

Run only the tests that cover lines that have been changed.

Install

composer require --dev brianhenryie/php-diff-test

Run

Run: phpunit --filter="$(phpdifftest)" or codecept run suitename "$(phpdifftest)"

How it works

Runs git diff, parses which lines have been changed, parses *.cov codecoverage files to match which tests cover those lines.

The script looks in the current working directory, its tests subfolder, and each of the tests immediate subfolders for *.cov.

It also checks tests for Codeception *.suite.y*ml files, and assumes a file named unit.cov corresponds with unit.suite.yml to determine should the output be formatted for codecept run... syntax rather than PHPUnit --filter="..." syntax.

Obviously, it's assumed you're working inside a Git repo and have previously generated code coverage.

TODO

• I think the diff doesn't track unstaged/uncommitted files which could have code coverage
• Also run tests changed in the diff / run all tests changed since the code coverage was generated (merge/increment coverage?)
• Allow specifying a hash to diff with i.e. make pull requests run faster
• https://github.com/sebastianbergmann/php-code-coverage/issues/571 code coverage annotations make this tool less thorough
• Tidy up the code I'm not sure is the diff report's lines the current lines or the before lines... use both for best effect
• Tests!