没有数据库支持就测试 Rails 应用程序几乎没有意义，因为许多 Rails 值是通过元编程（metaprogramming）把 SQL 特性编织起来而得到的。
Testing Rails applications without database backing would not be nearly as meaningful, given that much of Rails's value derives from weaving SQL features together through metaprogramming.
它通过一组XML清单进行编程，这些清单指定用于管理组件安装的元数据。
It is programmed through a set of XML manifests that specify the metadata to manage the installation of the component.
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