By default, whenever you have VS2010 generate a new unit test for a web method (an MVC controller in my case), it creates a hard-linked file path in the "AspNetDevelopmentServerHost" attribute. This may work fine if you’re the sole developer and code on only one machine, but what about when you work on a team or have multiple machines that will invariably have different file structures? MS recommends using "%PathToWebRoot%", but at least in my case, it always resolves to the default Visual Studio project folder in your User directory. Thankfully, you can also use the "$(SolutionDir)" macro, which should resolve to your project directory, wherever that may be. Thanks to Jason Skowronek for that tip.