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(* Copyright (c) 2021 Danny Willems <be.danny.willems@gmail.com>             *)
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(** Testing
    -------
    Component:    lib_mec
    Invocation:   dune exec src/lib_mec/test/main.exe \
                  -- --file test_neptunus.ml
    Subject:      Test lib mec
*)

open Mec.Hash

module Scalar = Ff.MakeFp (struct
  let prime_order =
    Z.of_string
      "52435875175126190479447740508185965837690552500527637822603658699938581184513"
end)

module Poseidon = Neptunus.Make (Scalar)

let test_perm_is_consistent () =
  let x = Array.make Neptunus.Constant.width (Scalar.of_string "17") in
  let y = Array.make Neptunus.Constant.width (Scalar.of_string "17") in
  let z = Array.make Neptunus.Constant.width (Scalar.of_string "19") in

  let state_x = Poseidon.Strategy.init x in
  let state_y = Poseidon.Strategy.init y in
  let state_z = Poseidon.Strategy.init z in

  Poseidon.Strategy.apply_perm state_x ;
  Poseidon.Strategy.apply_perm state_y ;
  Poseidon.Strategy.apply_perm state_z ;

  let res_x = Poseidon.Strategy.get state_x in
  let res_y = Poseidon.Strategy.get state_y in
  let res_z = Poseidon.Strategy.get state_z in
  assert (Array.for_all2 Scalar.eq res_x res_y) ;
  assert (not @@ Array.for_all2 Scalar.eq res_x res_z)

let () =
  Alcotest.run
    ~__FILE__
    "Neptunus"
    [
      ( "Properties",
        [Alcotest.test_case "Perm is consistent" `Quick test_perm_is_consistent]
      );
    ]