Set things up similarly to that described in VisualStudioCheatSheet.
Add the ArtOfTest WebAii .dlls to the project references.
Extend BaseNUnitTest for your test fixture. See http://www.artoftest.com/Resources/WebAii/Documentation/topicsindex.aspx?topic=usingnunit It may not be necessary to do this if you use the template.
ToBeWritten ...