In F# how do you pass a collection to xUnit's InlineData attribute

Question

I would like to be about to use a list, array, and/or seq as a parameter to xUnit\'s InlineData.

In C# I can do this:

using Xunit; //2.1.0

namespace C         


        

Answer 1

You can use the FSharp.Reflection namespace to good effect here. Consider some hypothetical function isAnswer : (string -> int -> bool) that you want to test with a few examples.

Here's one way:

open FSharp.Reflection
open Xunit

type TestData() =
  static member MyTestData =
    [ ("smallest prime?", 2, true)
      ("how many roads must a man walk down?", 41, false) 
    ] |> Seq.map FSharpValue.GetTupleFields

[)>]
let myTest (q, a, expected) =
  Assert.Equals(isAnswer q a, expected)

The key thing is the |> Seq.map FSharpValue.GetTupleFields line. It takes the list of tuples (you have to use tuples to allow different arguments types) and transforms it to the IEnumerable that XUnit expects.