{
  perSystem = {pkgs, ...}: let
    lua = import ../lib/lua.nix {inherit pkgs;};

    diffFiles = actual: expected:
      pkgs.runCommandWith {
        name = "diffFiles";
        derivationArgs.nativeBuildInputs = [pkgs.diffutils];
      }
      ''
        diff -u ${expected} ${actual}
        echo "Comparaison successful."
        touch $out
      '';
  in {
    checks.luaRender =
      diffFiles ./luaRender.lua
      <| lua.writeLua "debug.lua" {
        a.b.c = 42;
        list = [42 4.2 true false null];
        fn = lua.lambda [] <| lua.raw "print('hello world')";
        math.succ = lua.function "" ["n"] <| lua.return <| lua.raw "n + 1";
        non-var-name = 42;
        multilineFunc =
          lua.function "" []
          <| lua.raw ''
            print("hello world")
            print("goodbye world")
          '';
      };
  };
}