anchor.diff:  
           let expected = """source http://www.nuget.org/api/v2
   
  -nuget A 1.0
  -nuget C 1.0
  +nuget A
  +nuget C
   
   group Deps2
   source http://www.nuget.org/api/v2
   
  -nuget A 1.0
  -nuget C 1.0"""
  +nuget A
  +nuget C"""
   
           depFile.ToString()
           |> shouldEqual (normalizeLineEndings expected)
  
positive.code: 
          let expected = """source http://www.nuget.org/api/v2
  
  nuget A 1.0
  nuget C 1.0"""
  
          depFile.ToString()
          |> shouldEqual (normalizeLineEndings expected)
  
negative.code: group Foo
  source http://www.nuget.org/api/v2
  
  nuget A
  nuget B
  nuget C
  nuget D
  nuget E
  nuget F """ |> DependenciesFile.FromSource
  
  let projects4 = [
      ReferencesFile.FromLines [|"group Foo";"A";"B";"C";"D";"F"|]
  