https://github.com/gytis-ivaskevicius/flake-utils-plus/tree/master/tests
https://github.com/gytis-ivaskevicius/flake-utils-plus/blob/master/tests/channel-patching/flake.nix
        checks =
          let
            inherit (utils.lib.check-utils channels.nixpkgs) hasKey isEqual;
            hostConfig = self.nixosConfigurations.PatchedHost.config;
          in
          {

            # Patched package gets passed to `packageBuilder`
            patchedPackageGetsPassedToBuilders = isEqual self.packages.x86_64-linux.flake-utils-plus-test.pname "hello";