如果遇到：
phpunit....
To enable extensions, verify that they are enabled in those .ini files:
- /etc/php5/cli/php.ini
- /etc/php5/cli/conf.d/05-opcache.ini
....
请安装php-xml的扩展就好了。
laravel in centos
原文：http://www.cnblogs.com/utf87/p/5499203.html
