Integration tests for mastodon websocket

test/support/websocket_client.ex

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+defmodule Pleroma.Integration.WebsocketClient do
+  # https://github.com/phoenixframework/phoenix/blob/master/test/support/websocket_client.exs
+
+  @doc """
+  Starts the WebSocket server for given ws URL. Received Socket.Message's
+  are forwarded to the sender pid
+  """
+  def start_link(sender, url, headers \\ []) do
+    :crypto.start()
+    :ssl.start()
+
+    :websocket_client.start_link(
+      String.to_charlist(url),
+      __MODULE__,
+      [sender],
+      extra_headers: headers
+    )
+  end
+
+  @doc """
+  Closes the socket
+  """
+  def close(socket) do
+    send(socket, :close)
+  end
+
+  @doc """
+  Sends a low-level text message to the client.
+  """
+  def send_text(server_pid, msg) do
+    send(server_pid, {:text, msg})
+  end
+
+  @doc false
+  def init([sender], _conn_state) do
+    {:ok, %{sender: sender}}
+  end
+
+  @doc false
+  def websocket_handle(frame, _conn_state, state) do
+    send(state.sender, frame)
+    {:ok, state}
+  end
+
+  @doc false
+  def websocket_info({:text, msg}, _conn_state, state) do
+    {:reply, {:text, msg}, state}
+  end
+
+  def websocket_info(:close, _conn_state, _state) do
+    {:close, <<>>, "done"}
+  end
+
+  @doc false
+  def websocket_terminate(_reason, _conn_state, _state) do
+    :ok
+  end
+end