Ref: https://docs.moodle.org/dev/PHPUnit composer install --dev php admin/tool/phpunit/cli/init.php vendor/bin/phpunit theme/adaptable/tests/theme_adaptable_toolbox_test.php or vendor\bin\phpunit theme/adaptable/tests/theme_adaptable_toolbox_test.php vendor/bin/phpunit --group theme_adaptable or vendor\bin\phpunit --group theme_adaptable