common\WebTestCase::backupParametersFile PHP Method

    protected function backupParametersFile($kernelDir)
    {
        $filesystem = new Filesystem();
        if ($filesystem->exists($kernelDir . '/config/parameters.yml')) {
            $filesystem->copy($kernelDir . '/config/parameters.yml', $kernelDir . '/config/parameters.yml~backup');
        }
        if ($filesystem->exists($kernelDir . '/cache/test')) {
            $filesystem->remove($kernelDir . '/cache/test');
        }
    }