PHPUnit\Runner\CleverAndSmart\TestListener::startTestSuite PHP Method

    public function startTestSuite(TestSuite $suite)
    {
        if ($this->reordered) {
            return;
        }
        $this->reordered = true;
        $this->sort($suite);
        register_shutdown_function(array($this, 'onFatalError'));
        if (function_exists('pcntl_signal')) {
            pcntl_signal(SIGINT, array($this, 'onCancel'));
        }
    }