Type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft'
namespaces, unit-testing, visual-studio-2012
Solution
Ok I found out what the issue was. I had all the solution files in a different place than the usual default.
I had them in a Dropbox folder hoping that I can work on the solution from multiple computers, but apparently that was the cause of the issue.
Moving the whole solution to the default My Documents/VS 2012/Projects/ fixed the problem for me!
In short, if you want things to work smoothly, have the solution files in the usual place, unless you're an advanced user and know what you're doing (I'm not).
Problem
I can see from here, that the namespace `Visual Studio` should exist within namespace `Microsoft`, yet I get that error and none of my tests are working! The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) I am using Visual Studio 2012 with Windows 8.1 (all updated).