anchor.diff:  [<Test>]
   let ``should inherit _._ files to higher frameworks``() = 
       let model = 
  -        InstallModell.FromLibs([ @"..\Rx-Main\lib\net40\_._"; @"..\Rx-Main\lib\net20\_._" ])
  +        InstallModell.EmptyModel.Add([ @"..\Rx-Main\lib\net40\_._"; @"..\Rx-Main\lib\net20\_._" ])
               .UseLowerVersionLibIfEmpty()
   
       model.GetFiles(DotNetFramework(Framework "v2.0", Full)) |> shouldContain @"..\Rx-Main\lib\net20\_._"
  
positive.code: [<Test>]
  let ``should handle lib install of Microsoft.Net.Http for .NET 4.5``() = 
      let model = 
          InstallModell.FromLibs(
              [ @"..\Microsoft.Net.Http\lib\net40\System.Net.Http.dll" 
                @"..\Microsoft.Net.Http\lib\net40\System.Net.Http.Extensions.dll" 
                @"..\Microsoft.Net.Http\lib\net40\System.Net.Http.Primitives.dll" 
  
negative.code: [<Test>]
  let ``should skip buckets which contain placeholder while adjusting upper versions``() = 
      let model = 
          InstallModell.EmptyModel.Add([ @"..\Rx-Main\lib\net20\Rx.dll"; @"..\Rx-Main\lib\net40\_._"; ])
              .UseLowerVersionLibIfEmpty()
  
      model.GetFiles(DotNetFramework(Framework "v2.0", Full)) |> shouldContain @"..\Rx-Main\lib\net20\Rx.dll"
  