Please put the following code in a php file in the server and access it through a browser to view the result.
Change the username of database user from "root" to your "database-user", followed by the password of the database user from "testuser" to your "database-access-password".
If the connection was successful the page will display Success. Other wise it will display Could not select DB.
Code:
php
$con=mysql_connect("localhost","root","testuser") or die("Could not connect");
$db=mysql_select_db("test",$con) or die("Could not select DB");
echo "Success";