anchor.diff:              Assert.AreEqual(expected, actual)
           [""; "  "; "Ploeh"; "Fnaah"] |> List.iter test
   
  -    [<TestCase()>]
  +    [<Test>]
       member this.FilterNoneReturnsCorrectResult () =
           let test x =
               let actual = None |> Option.filter (fun _ -> x)
  
positive.code:             Assert.AreEqual(expected, actual)
          [false; true] |> List.iter test
  
      [<TestCase()>]
      member this.FilterSomeIntegerWhenPredicateEqualsInput () =
          let test x =
              let actual = x |> Some |> Option.filter ((=) x)
  
negative.code:             Assert.AreEqual(expected, actual)
          [""; " "; "Foo"; "Bar"] |> List.iter test
  
      [<Test>]
      member this.FilterSomeIntegerWhenPredicateReturnsFalse () =
          let test x =
              let actual = x |> Some |> Option.filter (fun _ -> false)
  