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Widen the PHPUnit version constraint to also accept ^13.0 alongside ^12.5.8. Update the conflict rule accordingly. Code audit of Pest's PHPUnit integration surface: - All PHPUnit Event classes used by Pest (BeforeFirstTestMethodErrored, AfterLastTestMethodErrored, Errored, Failed, Skipped, ConsideredRisky, MarkedIncomplete, and all subscribers) retain the same namespace and API in PHPUnit 13. - testClassName() on errored hook events is NOT among the removed methods (only removed from "called"/"finished" hook events). - Internal APIs (TextUI\Application, Configuration\Registry, TestResult\Facade, CliArguments\Builder, XmlConfigurationFileFinder, XmlConfiguration\DefaultConfiguration, XmlConfiguration\Loader, Util\ExcludeList) all retain their namespaces and method signatures. - None of the removed PHPUnit 13 APIs (Assert::isType(), assertContainsOnly(), containsOnly(), #[RunClassInSeparateProcess], --dont-report-useless-tests) are used by Pest. Note: nunomaduro/collision ^8.8.3 currently conflicts with PHPUnit 13. Collision PR pestphp#342 tracks removing that conflict. Once collision is updated, this constraint will resolve cleanly.
This was referenced Feb 10, 2026
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Summary
Widens the PHPUnit version constraint to accept
^13.0alongside^12.5.8, and updates the conflict rule from>12.5.8to>13.1.Code audit
I audited every PHPUnit class/interface that Pest imports across
src/:BeforeFirstTestMethodErrored,AfterLastTestMethodErrored,Errored,Failed,Skipped,ConsideredRisky,MarkedIncomplete) and their subscriber interfaces retain the samePHPUnit\Event\Testnamespace and API in PHPUnit 13.testClassName(): Still present on errored hook events — PHPUnit 13 only removed it from "called"/"finished" hook events, which Pest doesn't use.TextUI\Application,Configuration\Registry,TestResult\Facade,CliArguments\Builder,XmlConfigurationFileFinder,XmlConfiguration\DefaultConfiguration,XmlConfiguration\Loader,Util\ExcludeList— all retain their namespaces and method signatures in PHPUnit 13.Assert::isType(),assertContainsOnly(),containsOnly(),#[RunClassInSeparateProcess],--dont-report-useless-tests— none are used in Pest's source.Dependency note
nunomaduro/collision ^8.8.3currently conflicts withphpunit/phpunit >=13.0.0. Collision PR #342 tracks adding PHPUnit 13 support there. Once collision updates its conflict list, this constraint will resolve cleanly.The circular dependency (Pest → Collision → PHPUnit 13 blocked → Pest) needs to be broken — this PR breaks it from the Pest side. Collision can then update independently since Pest is only a dev dependency there.
PHPUnit 13 key changes (for reference)
PHPUnit 13 requires PHP 8.4+. Removed APIs:
Assert::isType(),assertContainsOnly(),assertNotContainsOnly(),containsOnly()testClassName()on called/finished hook events (NOT errored events)Configuration::includeTestSuite()/excludeTestSuite()#[RunClassInSeparateProcess]attribute--dont-report-useless-testsCLI optionNone of these affect Pest's runtime code.