Instructions for adding NUnit Test Framework to Visual Studio 2010 are lengthy and complicated. In a previous installation of Visual Studio 2010 I remember having used an extension that made the task much easier but I never noted down the name or url the extension.
I have finally managed to get hold of the name and links of the extension. And so, lest I forget, I am noting it down. I never know when I might require it again.
Just download and double click to install