Behat\Behat\Tester\Cli\RerunController::writeCache PHP Method

    public function writeCache()
    {
        if (!$this->getFileName()) {
            return;
        }
        if (file_exists($this->getFileName())) {
            unlink($this->getFileName());
        }
        if (0 === count($this->lines)) {
            return;
        }
        file_put_contents($this->getFileName(), json_encode($this->lines));
    }