anchor.diff:  
   Target "Test" (fun _ ->
     let testDlls = !!(basePath </> "*.Tests/bin/Debug/*.Tests.dll")
  -  testDlls 
  +  testDlls
     |> xUnit2 (fun p -> p)
   )
   
  
positive.code: #r @"packages/FAKE/tools/FakeLib.dll"
  open Fake
  open Fake.Testing.XUnit2
  
  let testDir = ".test"
  
  let createBuildAndTest proj version = 
    let basePath = sprintf "./%s/%s" proj version
    let build() = 
        trace (sprintf "Building %s %s" proj version)
        let sln = !! (basePath </> "*.sln")
        trace (sprintf "Will build solution: %A" sln)
  
negative.code:             OutputPath = (basePath </> "packages")
              Retries = 4 })
      |> ignore
  
    fun _ ->
      restorePackages()
      build()
  