anchor.diff:  [<Test>]
   let ``should detect reference nodes``() =
       let references =
  -        ProjectFile.getProject "./TestData/Project1.fsproj"
  +        ProjectFile.getProject "./TestData/Project1.fsprojtest"
           |> ProjectFile.getReferences
   
       references.Length |> shouldEqual 4
  
positive.code: 
  [<Test>]
  let ``should update single nodes``() =
      let doc = ProjectFile.getProject "./TestData/Project1.fsproj"
  
      let node = (ProjectFile.getReferences doc).[2]
      let newNode = { node with HintPath = Some @"..\..\packages\NUnit.2.7.5\lib\nunit.framework.dll" }
  
negative.code: 
  [<Test>]
  let ``should add single node``() =
      let doc = ProjectFile.getProject "./TestData/Project1.fsprojtest"
  
      let hintPath = @"..\..\packagesFAKE\lib\Fake.Core.dll"
      let newNode = { DLLName = "FAKE"; HintPath = Some hintPath; Private = false; Node = None }
  