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{ pkgs, ... }:
let
  inherit (pkgs) lib;

  tests = {
    # TODO: uncomment stable
    #  - Blocked on https://github.com/NixOS/nixpkgs/issues/138584 which has a
    #    PR in staging: https://github.com/NixOS/nixpkgs/pull/139986
    #  - Alternatively, blocked on a NixOps 2 release
    #    https://github.com/NixOS/nixops/issues/1242
    # stable = testsLegacyNetwork { nixopsPkg = pkgs.nixops; };
    unstable = testsForPackage { nixopsPkg = pkgs.nixops_unstable_minimal; };

    # inherit testsForPackage;
  };

  testsForPackage =
    args:
    lib.recurseIntoAttrs {
      legacyNetwork = testLegacyNetwork args;
      passthru.override = args': testsForPackage (args // args');
    };

  testLegacyNetwork =
    { nixopsPkg, ... }:
    pkgs.testers.nixosTest {
      name = "nixops-legacy-network";
      nodes = {
        deployer =
          {
            config,
            lib,
            nodes,
            pkgs,
            ...
          }:
          {
            imports = [ ../../modules/installer/cd-dvd/channel.nix ];
            environment.systemPackages = [ nixopsPkg ];
            nix.settings.substituters = lib.mkForce [ ];
            users.users.person.isNormalUser = true;
            virtualisation.writableStore = true;
            virtualisation.additionalPaths = [
              pkgs.hello
              pkgs.figlet
            ];
            virtualisation.memorySize = 2048;

            # TODO: make this efficient, https://github.com/NixOS/nixpkgs/issues/180529
            system.includeBuildDependencies = true;
          };
        server =
          { lib, ... }:
          {
            imports = [ ./legacy/base-configuration.nix ];
          };
      };

      testScript =
        { nodes, ... }:
        let
          deployerSetup = pkgs.writeScript "deployerSetup" ''
            #!${pkgs.runtimeShell}
            set -eux -o pipefail
            cp --no-preserve=mode -r ${./legacy} unicorn
            cp --no-preserve=mode ${../ssh-keys.nix} unicorn/ssh-keys.nix
            mkdir -p ~/.ssh
            cp ${snakeOilPrivateKey} ~/.ssh/id_ed25519
            chmod 0400 ~/.ssh/id_ed25519
          '';
          serverNetworkJSON = pkgs.writeText "server-network.json" (
            builtins.toJSON nodes.server.system.build.networkConfig
          );
        in
        ''
          import shlex

          def deployer_do(cmd):
              cmd = shlex.quote(cmd)
              return deployer.succeed(f"su person -l -c {cmd} &>/dev/console")

          start_all()

          deployer_do("cat /etc/hosts")

          deployer_do("${deployerSetup}")
          deployer_do("cp ${serverNetworkJSON} unicorn/server-network.json")

          # Establish that ssh works, regardless of nixops
          # Easy way to accept the server host key too.
          server.wait_for_open_port(22)
          deployer.wait_for_unit("network.target")

          # Put newlines on console, to flush the console reader's line buffer
          # in case nixops' last output did not end in a newline, as is the case
          # with a status line (if implemented?)
          deployer.succeed("while sleep 60s; do echo [60s passed]; done >&2 &")

          deployer_do("cd ~/unicorn; ssh -oStrictHostKeyChecking=accept-new root@server echo hi")

          # Create and deploy
          deployer_do("cd ~/unicorn; nixops create")

          deployer_do("cd ~/unicorn; nixops deploy --confirm")

          deployer_do("cd ~/unicorn; nixops ssh server 'hello | figlet'")
        '';
    };

  inherit (import ../ssh-keys.nix pkgs) snakeOilPrivateKey snakeOilPublicKey;

in
tests