think\PhpunitHelper::__construct PHP Method

    public function __construct($app_path = null, $think_path = null, $runtime_path = null)
    {
        $const = $this->guessPath();
        if ($app_path === null) {
            $app_path = $const['APP_PATH'];
        }
        if ($think_path === null) {
            $think_path = $const['THINK_PATH'];
        }
        if ($runtime_path === null) {
            $runtime_path = $const['ROOT_PATH'] . '/Runtime-test';
        }
        if (!file_exists($app_path)) {
            throw new \RuntimeException($app_path . '不存在');
        }
        if (!file_exists($think_path)) {
            throw new \RuntimeException($think_path . '不存在');
        }
        if (!file_exists($runtime_path)) {
            $bool = mkdir($runtime_path);
            if (!$bool) {
                throw new \RuntimeException($runtime_path . '创建失败');
            }
        } else {
            if (!is_writable($runtime_path)) {
                throw new \RuntimeException($runtime_path . '不可写');
            }
        }
        /**
         * 单元测试,会出现变量重复定义错误,使用defined来判断
         */
        defined('APP_DEBUG') or define('APP_DEBUG', true);
        defined('APP_PATH') or define('APP_PATH', rtrim($app_path, '\\/') . '/');
        defined('RUNTIME_PATH') or define('RUNTIME_PATH', rtrim($runtime_path, '\\/') . '/');
        defined('THINK_PATH') or define('THINK_PATH', rtrim($think_path, '\\/') . '/');
        $_SERVER['REQUEST_METHOD'] = 'GET';
        $_SERVER['REMOTE_ADDR'] = '127.0.0.1';
        $_SERVER['REMOTE_PORT'] = '32800';
        $_SERVER['SERVER_ADDR'] = '127.0.0.1';
        $_SERVER['SERVER_PROTOCOL'] = 'HTTP/1.1';
        $_SERVER['HTTP_REFERER'] = '/';
        $this->_defineConsts();
    }