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Pick exactly the tests you want. In the dashboard (vendor/bin/golem ui), every class and test has a checkbox: run a handful of tests, a few classes, or only those that failed last time (Failed). Your choice is kept in the browser for next time.
Several filters. --filter takes patterns separated by | and runs the tests matching any of them:
vendor/bin/golem --filter='KitMenuTest|HealCommandTest::testRegular'The live demo has it too, and now says which test fails on purpose.
Everything is in the changelog.