In order to update a last_seen field when a User leaves their UserChannel, I am starting a GenServer, on join, that monitors the User's UserChannel process, and makes the db call on reception of :DOWN signal.

I’m trying to test this.

test "joins succesfully", %{user_a: user} do
  assert {:ok, _, _socket} =
            UserSocket
            |> socket("user_socket:#{user.id}", %{user_id: user.id})
            |> subscribe_and_join(UserChannel, "user:#{user.id}")
end

Currently getting this error

[error] GenServer #PID<0.629.0> terminating
** (DBConnection.OwnershipError) cannot find ownership process for #PID<0.629.0>.

The module that tracks the user channel

defmodule ChataWeb.UserTracker.Process do
  use GenServer, restart: :transient

  alias Chata.Accounts

  def start_link(%{user_id: user_id, user_channel_pid: user_channel_pid}, opts \\ []) do
    init_args = %{user_id: user_id, user_channel_pid: user_channel_pid}
    GenServer.start_link(__MODULE__, init_args, opts)
  end

  def init(init_args) do
    Process.monitor(init_args.user_channel_pid)
    {:ok, init_args}
  end

  def handle_info({:DOWN, _ref, :process, _pid, _}, state) do
    %{user_id: user_id} = state
    Accounts.update_last_seen(user_id)
    {:stop, :normal, state}
  end
end

I suppose this is happening because the test process completes before the db call does.

Any ideas how to get this to work?