NUnit Engine Version Conflicts in Visual Studio
There have been some issues filed recently about exceptions being thrown when running NUnit tests under the VS test window. In many cases, they result in trying to install two different versions of the NUnit Engine into the same project directory. I'll try to explain how the problem arises and what to do about it. The table at the end of this post will also be useful to anyone wanting to know which version of the engine is being used by the adapter version they have installed.