{pkgs}: let
  acme_scripts = import ./scripts.nix {inherit pkgs;};
in {
  prepare = clients: extra:
  # The parens are needed for the syntax highlighting to work.
    ( # python
      ''
        # Start dependencies for the other services
        acme.start()
        acme.wait_for_unit("pebble.service")
        name_server.start()
        name_server.wait_for_unit("nsd.service")

        # Start actual test
        start_all()

        with subtest("Add pebble ca key to all services"):
          for node in [name_server, ${builtins.concatStringsSep "," clients}]:
            node.wait_until_succeeds("curl https://acme.test:15000/roots/0")
            node.succeed("${acme_scripts.add_pebble_ca_certs}")
      ''
    )
    + extra;
}