LiveView artifacts

page_live_test.exs

defmodule MyAppWeb.PageLiveTest do
  use MyAppWeb.ConnCase

  import Phoenix.LiveViewTest

  @tag :tmp_dir
  test "disconnected and connected render", %{conn: conn, tmp_dir: tmp_dir} do
    {:ok, page_live, disconnected_html} = live(conn, "/")
    assert disconnected_html =~ "Welcome to Phoenix!"

    assert page_live
           |> open_browser(&File.copy!(&1, Path.join([tmp_dir, "welcome.html"])))
           |> render() =~ "Welcome to Phoenix!"
  end
end