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我有一个启动套接字连接并订阅和加入主题的测试。然后我将一条消息推送到通道，该通道执行一些工作并保留一些数据。然后我在模拟客户端关闭连接的套接字上使用 ChannelTest.close/2。然后我想修改操纵的数据并创建另一个套接字连接来测试一些行为。

我的问题是 ChannelTest.close/2 导致我的测试失败并返回** (EXIT from #PID<0.558.0>) shutdown: :closed。我怎样才能防止这种情况发生？

这是一些相关的代码

defmodule PlexServer.EmpireChannelTest do  

  use PlexServer.ChannelCase

  alias PlexServer.EmpireChannel
  alias PlexServer.EmpireTemplate
  alias PlexServer.EmpireInstance

  setup do
    ...

    {:ok, _, socket} =
      socket("user_id", %{})
      |> subscribe_and_join(EmpireChannel,
        "empire:#{empire.id}",
        %{"guardian_token" => jwt})

    {:ok, socket: socket, empire: empire, jwt: jwt}
  end

  test "research infrastructure", %{socket: socket, empire: empire, jwt: jwt} do
    ...

    ref = push socket, "command", request
    assert_reply ref, :ok, _, 1000

    close(socket) #fails here

    ...
  end
end

defmodule PlexServer.UserSocket do
  use Phoenix.Socket
  use Guardian.Phoenix.Socket

  ## Channels
  # channel "rooms:*", PlexServer.RoomChannel
  channel "empire:*", PlexServer.EmpireChannel
  channel "user:*", PlexServer.UserChannel

  ## Transports
  transport :websocket, Phoenix.Transports.WebSocket

  def connect(_params,_) do
    :error
  end

  def id(_socket), do: nil
end


defmodule PlexServer.EmpireChannel do
  use PlexServer.Web, :channel
  use Guardian.Channel

  alias PlexServer.EmpireInstance
  alias PlexServer.EmpireServer

  ...

  def join("empire:" <> empire_id, %{claims: _claims, resource: user}, socket) do
    ...
    #Starts a process through a supervisor here
  end

  def join("empire:" <> _, _, _socket) do
    {:error, data_error(:auth, "not authorized, did you pass your jwt?")}
  end

  # Channels can be used in a request/response fashion
  # by sending replies to requests from the client
  def handle_in("ping", payload, socket) do
    {:reply, {:ok, payload}, socket}
  end

  def handle_in("show", _, socket) do    
    ...
  end

  def handle_in("command", request, socket) do
    ...
  end

  def handle_in("remove", _, socket) do
    ...
  end

  def handle_in("ship_templates", _, socket) do
    ...
  end
end

按照评论中链接的答案，我添加了一些代码：

Process.flag(:trap_exit, true)
monitor_ref = Process.monitor(socket.channel_pid)
close(socket)

现在我收到一条不同的错误消息：** (exit) exited in: GenServer.call(PlexServer.EmpireSupervisor, {:terminate_child, :empire4}, :infinity) ** (EXIT) no process

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