Adding guard to macro that just calls another function

Questions & Help Questions
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1

I have a problem, where i have a macro the calls another function. I want to be able to add optional guards to my macro, and call the nested function with those guards. I have a solution, but i feel like it is verbose and there is something i dont know of. Its the use of case do that feels clunky, and the only difference is the when clause.

Example

  defmacro assert_push(
             event,
             payload,
             timeout \\ 100
           ) do
    case payload do
      {:when, _, [pattern, guard]} ->
        quote do
          assert_receive %Phoenix.Socket.Message{
                           event: unquote(event),
                           payload: unquote(pattern)
                         }
                         when unquote(guard),
                         unquote(timeout)
        end

      _ ->
        quote do
          assert_receive %Phoenix.Socket.Message{
                           event: unquote(event),
                           payload: unquote(payload)
                         },
                         unquote(timeout)
        end
    end
  end