{
  pkgs,
  inputs,
  self,
}: let
  localPackages = import ../pkgs {inherit pkgs inputs;};
  mkPkgsWithOverlay = overlay:
    import inputs.nixpkgs {
      system = pkgs.stdenv.hostPlatform.system;
      config.allowUnfree = true;
      overlays = [overlay];
    };

  modifiedPkgs = mkPkgsWithOverlay self.overlays.modifications;
  defaultPkgs = mkPkgsWithOverlay self.overlays.default;

  expectedVersion = "2.29.4";
  expectedSrcHash = "sha256-Vc10fXKn21PSlv6Sk+5zyi2efkKup1Vi+9+vyJd2I1k=";
  expectedPnpmHash = "sha256-2UFKP5bo06afaMPD+dIYQ7O0NiyZai4i8vkidi7HfxE=";
  expectedChangelog = "https://github.com/n8n-io/n8n/releases/tag/n8n@${expectedVersion}";

  checkN8nOverride = overlayName: package:
    if package.version != expectedVersion
    then throw "${overlayName} n8n version is ${package.version}, expected ${expectedVersion}"
    else if package.src.outputHash != expectedSrcHash
    then throw "${overlayName} n8n src hash is ${package.src.outputHash}, expected ${expectedSrcHash}"
    else if package.pnpmDeps.outputHash != expectedPnpmHash
    then throw "${overlayName} n8n pnpmDeps hash is ${package.pnpmDeps.outputHash}, expected ${expectedPnpmHash}"
    else if package.meta.changelog != expectedChangelog
    then throw "${overlayName} n8n changelog is ${package.meta.changelog}, expected ${expectedChangelog}"
    else "ok";
in
  pkgs.runCommand "n8n-overlay-test" {
    localN8nAbsent =
      if localPackages ? n8n
      then throw "pkgs/default.nix must not export a local n8n package"
      else "ok";
    modificationsOverlayN8n = checkN8nOverride "overlays.modifications" modifiedPkgs.n8n;
    defaultOverlayN8n = checkN8nOverride "overlays.default" defaultPkgs.n8n;
  } ''
    touch $out
  ''