I decided today to go back and take another chance to NUnit, but firstly I needed to have a possibility to integrate the NUnit and VS, because launching external program to run my tests is tiring. After few minutes I fonud a nice VS plugin to integrate a Visual Studio and NUnit: it's name is Visual NUnit.
I had one problem with this extension. When I wanted to fire my first NUnit test, I had an System.BadImageFormatException exception. I had to change the tests project target platform to x86.
After checked the Visual NUnit I wanted to have a some snippets to create the basic NUnit structures without wasting my time to write it manually all the time. Fortunatelly I found it either: link.