Domain Mapping & Removing install directory from URL

Ok. First off I have looked for the answer everything but I can only find answers to either half of my problem and not the complete solution.

My predicament is that I have two seperate installs on the server, not using multi-site.

I am using domain mapping, and the htaccess file in the root says

# pointing domain_1.com to folder_1
ReWriteCond %{HTTP_HOST} example.com
ReWriteCond %{REQUEST_URI} !example/
ReWriteRule ^(.*)$ example/$1 [L]

# pointing domain_2.com to folder_2
ReWriteCond %{HTTP_HOST} test.com
ReWriteCond %{REQUEST_URI} !test/
ReWriteRule ^(.*)$ test/$1 [L

Example site URL is http://www.example.com and wordpress installation http://www.example.com/example

Test site URL is http://www.test.com/test and wordpress installation http://www.test.com/test

I am confused as to how to remove the installation directory from Test site, since only one index file appears in the root, that of the example site.