Follow up from #177 PHPUnit has multiple options to halt test execution depending on test outcome: * `--stop-on-defect` * `--stop-on-error` * `--stop-on-failure` * `--stop-on-warning` * `--stop-on-risky` * `--stop-on-skipped` * `--stop-on-incomplete` Paraunit should intercept (and forward) those, since it could empty the test pipelines, to cut short the execution when needed.