nixpkgs/nixos/tests/etcd/etcd.nix

# This test runs simple etcd node
{ lib, ... }:
{
  name = "etcd";
  meta.maintainers = with lib.maintainers; [ offline ];

  nodes.node = {
    services.etcd.enable = true;
  };

  testScript = ''
    with subtest("should start etcd node"):
        node.start()
        node.wait_for_unit("etcd.service")
        # Add additional wait for actual readiness
        node.wait_until_succeeds("etcdctl endpoint health")

    with subtest("should write and read some values to etcd"):
        node.succeed("etcdctl put /foo/bar 'Hello world'")
        node.succeed("etcdctl get /foo/bar | grep 'Hello world'")
  '';
}