tryFindBack is consistent

dotnet · Jul 29, 2015 · d40c85f · d40c85f
1 parent 73c59c7
commit d40c85f
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/src/fsharp/FSharp.Core.PropertyTests/CollectionModulesConsistency.fs b/src/fsharp/FSharp.Core.PropertyTests/CollectionModulesConsistency.fs
@@ -1030,3 +1030,15 @@ let ``tryFind is consistent`` () =
     Check.QuickThrowOnFailure tryFind<int>
     Check.QuickThrowOnFailure tryFind<string>
     Check.QuickThrowOnFailure tryFind<NormalFloat>
+
+let tryFindBack<'a when 'a : equality> (xs : 'a []) predicate =
+    let s = xs |> Seq.tryFindBack predicate
+    let l = xs |> List.ofArray |> List.tryFindBack predicate
+    let a = xs |> Array.tryFindBack predicate
+    s = a && l = a
+
+[<Test>]
+let ``tryFindBack is consistent`` () =
+    Check.QuickThrowOnFailure tryFindBack<int>
+    Check.QuickThrowOnFailure tryFindBack<string>
+    Check.QuickThrowOnFailure tryFindBack<NormalFloat>