I like to test things manually to bypass any potential issues cause by multiple layers of applications. Here is how I found to test radius authentication using the command line radclient command:
[root@radius ~]# /usr/local/bin/radclient -x localhost:1812 auth <password> < User-Name="<valid-username>" < User-Password="<valid-password>" < > Sending Access-Request of id 228 to 63.172.126.12:1812 > User-Name = "username" > User-Password = "password" > rad_recv: Access-Accept packet from host 11.22.33.44:1812, id=228, length=180