ASP.NET unit testing

Some time ago mi pal Keiji Miyabe asked me how to unit test ASP.NET pages. As you know, the idea of unit testing was born in the business layer (where the problem is solved, among others, by NUnit) but it has started to grow into other layers as well, for example NUnitAsp tests web pages (exactly what Keiji was looking for). I discovered this while checking fellow RD Scott Hanselman blog , where he mentions and interesting alternative way to test pages that leverages Cassini, the open source web server written in C#.