Default setting of Rails

i have just installed RoR. when i create a new rails project use the command "rails test" without any options, the default database setting is sqlite3 in my computer. the default should be MySQL, is anything i did wrong?

how do i fix it?

The new default is SQLite. This is a really recent change, so if you're following nearly any book in print or an older online article, it will say MySQL.

To change it, you can use the -d option.

   rails your_app -d mysql

--Jeremy