defmodule Mv.Membership.JoinRequestSubmitEmailFailureTest do
  @moduledoc """
  Tests that when join confirmation email delivery fails, the domain returns
  {:error, :email_delivery_failed} (and the LiveView shows an error). Uses
  FailingMailAdapter to simulate delivery failure; async: false to avoid config races.
  """
  use Mv.DataCase, async: false

  alias Mv.Membership

  @valid_submit_attrs %{
    email: "fail#{System.unique_integer([:positive])}@example.com"
  }

  test "submit_join_request returns {:error, :email_delivery_failed} when mail delivery fails" do
    saved = Application.get_env(:mv, Mv.Mailer)

    Application.put_env(
      :mv,
      Mv.Mailer,
      Keyword.put(saved || [], :adapter, Mv.TestSupport.FailingMailAdapter)
    )

    on_exit(fn ->
      Application.put_env(:mv, Mv.Mailer, saved)
    end)

    token = "fail-token-#{System.unique_integer([:positive])}"
    attrs = Map.put(@valid_submit_attrs, :confirmation_token, token)

    assert {:error, :email_delivery_failed} = Membership.submit_join_request(attrs, actor: nil)
  end
end