[elixir-core:9528] Add an assert_receive to ExUnit that allows specifying which PID received the message

[Adam Lancaster]

It would be great if we could expose a function that allowed us to say 
something like this:

defmodule MyGen do
  use GenServer

  @impl true
  def init(data) do
    {:ok, data}
  end

end

{:ok, pid} = MyGen.start_link(MyGen, :hi)

assert_receive(pid, :hello)




I recently learned you can do something like this:

:erlang.trace(pid, true, [:receive])

So I wondered if that or :erlang.trace_delivered may be helpful here.

Best

Adam

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