anchor.diff:          file "readme.md"
       ]
   
  -let expectOk onError = function
  -    | Error _ -> failwith onError
  -    | Ok result -> result
  -
   [<Test>]
   let ``Use stored sort on path change`` () =
       // Arrange
  
positive.code:     let result = Nav.openPath fs newLocation SelectNone model
  
      // Assert
      let resultModel = expectOk "Failed to open path" result
      resultModel.Sort |> shouldEqual (Some expected)
  
  
negative.code:     let result = Nav.openPath fs storedLocation SelectNone model
  
      // Assert
      let resultModel = assertOk result
      resultModel.Sort |> shouldEqual (Some expected)
  
  [<Test>]
  