anchor.diff:  [<Fact>]
   let SelectMethodThrowsForNullType() =
       // Fixture setup
  -    let dummyBuilder =
  -        { new ISpecimenBuilder with
  -              member this.Create(r, c) = obj() }
       let sut = FoqMethodQuery dummyBuilder
       // Exercise system and verify outcome
       raises<ArgumentNullException> <@ sut.SelectMethods(null) @>
  
positive.code: let SelectMethodReturnsMethodForInterface() =
      // Fixture setup
      let requestType = typeof<IInterface>
      let dummyBuilder =
          { new ISpecimenBuilder with
                member this.Create(r, c) = obj() }
      let sut = FoqMethodQuery dummyBuilder
      // Exercise system
      let result = sut.SelectMethods(requestType)
  
negative.code:             ||| BindingFlags.Instance
              ||| BindingFlags.NonPublic)         
          |> Seq.map(fun ci -> ci.GetParameters())
      let sut = FoqMethodQuery dummyBuilder
      // Exercise system
      let result = 
  