Infection PHP

@OskarStark 👀

Hot take: 100% code coverage is a vanity metric. 📊 I'd rather have 60% coverage of critical paths than 100% coverage of getters, setters etc. Agree or disagree? 🤔

@mattpocockuk There is a native Claude Chrome plugin now code.claude.com/docs/en/chrome

Frontend is WAY harder for AI than backend. That's because it's flying blind. It can't test the code in the environment where it's running - the browser. Here's how to hook up AI to your browser:

Infection 0.32.3 has been released with new `--max-timeouts` and `--with-timeouts` options. Read the details in this blog post to understand how it helps with speeding up Mutation Testing and why you should start using them! infection.github.io/2026/01/14/wha… Thanks @sanmai!

🎄 Xmas present Infection 0.32.0 has been released: - Format-presering pretty printing - new GitHub loggers with collapsable sections - Symfony 8 support; webmozart/assert@v2 support - and much more github.com/infection/infe…

Looks like #phpunit xml code-coverage generation could get nearly twice as fast in the future. this would for example considerably reduce overhead of the necessary "initial-test" step when running @infection_php on your project.

How to write custom mutators: infection.github.io/guide/custom-m…

.@phpstan has added @infection_php for PRs on GH Actions with a set of custom rules 🚀 github.com/phpstan/phpsta…

.@xepozz started working on Infection Plugin for @phpstorm, please share your ideas here: github.com/infection/infe… - What would you like to see? - How would you use it? - Where would you want to see Mutants diffs? Let's make it useful.

💡TIP: It's worth to remind that you can use `php://stdout` or `php://stderr` channels to report Infection's details directly to the console when you use it on CI, for example.

@maks_rafalko @phpstorm That would be awesome 🙏

@phpstorm @infection_php please ❤️

We want the PHP open source community to thrive. That's why we're now committed to sponsor 5 open source projects per year: blog.jetbrains.com/phpstorm/2025/… There's actually one more spot open for 25-26, which project would you suggest we sponsor?

Thank you @lambdatesting for sponsoring our Open Source work on Infection. We already have 4 companies and a bunch of individuals who support us on GitHub. If you or you company(!) relies on Infection - please support us. github.com/sponsors/infec… Thank you all.

Blogged about my hands-on experience with @infection_php Its a short super top level article to give you an overall idea what to expect from it. what do you think about that? feedback welcome. staabm.github.io/2025/08/01/inf…

@krakjoe Interesting! Will it be possible to install composer packages?

Hey #PHP, em is in a separate repo, I got a working action together and a pipeline ... Here are 6 versions of php to play with: krakjoe.github.io/em/ github.com/krakjoe/em #php #wasm

Starting from 0.31.0, Infection doesn't mutate uncovered code by default anymore. Read upgrade guide: github.com/infection/infe…

In case you are getting timed-out #mutants while mutation testing with @infection_php (e.g. because of infinite loops), the upcoming release should run faster for you. on infection/infection with 16 timed-out mutants, we saw a ~21% perf boost 🚀

@pronskiy 👀 github.com/infection/infe…

Hey! I’m putting together the next PHP Annotated. If you’ve worked on something cool lately and want it featured, feel free to drop it in this thread or DM me

@G_Gilles31 not sure it's clear what needs to be done. Could you please create a feature request on Infection GitHub repo so we can have examples & discussion? Thank you.

@infection_php Why not a PHP attribute for Infection on a class that allows specifying a minimum coverage percentage? For example, the overall project coverage is set to 100%, but for a specific class, we allow 50%.

Periodic question: what is the most wanted feature you would like us to implement in the near future? Any ideas or something that bothers you?

So now we have an experimental @phpstan integration in Infection, by `--static-analysis-plugin=phpstan`. Let's try to do the same for @psalmphp - created a feature request to make it possible: github.com/vimeo/psalm/di… Give it some love!

past few weeks I have concentrated my opensource efforts onto @infection_php. focus was on developer experience - make it easer for newcomers to apply the tool and reduce noise by removing redundant mutations. this got just released. feedback welcome. #dx #mutationtesting

@MabarDev Interesting. Would you mind creating an issue so we can discuss it farther on GH?

@infection_php No mutating of strings passed to filesystem functions. Fortunately it deleted just the project and not the whole system 😆 Including wrappers like symfony/filesystem Perhaps phpstan would be able to track that?