accessing NUnit

I would like to use NUnit in Unity. I can Access NUnit from boo with

import NUnit.Framework from "nunit.framework"

in C# is there a way to specify where a namespace is or will that namespaces are not allowed in Unity stop me.

I tried

using NUnit.Core;

but I get a

message.

Cheers,
Grant

You probably need to add the NUnit .Net 2.0 DLLs into your asset folder.