尝试阅读Hound中的网页时,我收到了Hound.start_session的编译错误

时间:2019-07-03 17:08:43

标签: selenium elixir mix hound

我开始了一个新项目,并按如下方式进行配置:

mix new example
cd example

我清空了“ lib / example.ex”并在其中放置了以下代码:

Application.start :hound

defmodule Example do
  use Hound.Helpers

  def run do
    Hound.start_session

    navigate_to "http://akash.im"
    IO.inspect page_title()

    # Automatically invoked if the session owner process crashes
    Hound.end_session
  end
end

Example.run

这是https://github.com/HashNuke/hound/blob/master/notes/simple-browser-automation.md

提供的示例代码

然后我通过brew install selenium-server-standalone安装了Selenium服务器(我在MacOS上),通过brew services start selenium-server-standalone启动了它,并将config :hound, driver: "selenium"添加到config/config.exs

我添加了Application.ensure_all_started(:hound)作为test/test_helper.exs的第一行。

最后,我将{:hound, "~> 1.0"}添加到mix.exs并运行mix test。那是当我收到以下编译错误时:

localhost:example alex$ mix test
===> Compiling parse_trans
===> Compiling mimerl
===> Compiling metrics
===> Compiling unicode_util_compat
===> Compiling idna
==> jason
Compiling 8 files (.ex)
Generated jason app
==> ssl_verify_fun
Compiling 7 files (.erl)
Generated ssl_verify_fun app
===> Compiling certifi
===> Compiling hackney
==> hound
Compiling 37 files (.ex)
Generated hound app
==> example
Compiling 1 file (.ex)

== Compilation error in file lib/example.ex ==
** (ArgumentError) argument error
    (stdlib) :ets.lookup(Hound.SessionServer, #PID<0.592.0>)
    (hound) lib/hound/session_server.ex:19: Hound.SessionServer.current_session_id/1
    (hound) lib/hound/session_server.ex:13: Hound.SessionServer.session_for_pid/2
    lib/example.ex:7: Example.run/0
localhost:example alex$ mix test
Compiling 1 file (.ex)

== Compilation error in file lib/example.ex ==
** (ArgumentError) argument error
    (stdlib) :ets.lookup(Hound.SessionServer, #PID<0.160.0>)
    (hound) lib/hound/session_server.ex:19: Hound.SessionServer.current_session_id/1
    (hound) lib/hound/session_server.ex:13: Hound.SessionServer.session_for_pid/2
    lib/example.ex:7: Example.run/0

我忘记某个步骤或配置错误吗?非常感谢您的帮助,谢谢!

1 个答案:

答案 0 :(得分:1)

  

我清空了lib/example.ex并在其中放置了以下代码:

 defmodule Example do
   ...
 end

 Example.run

.ex文件和.exs文件之间存在差异。您决定将代码放入应用程序的主.ex文件中。摆脱这一行:

Example.run

然后,要执行Example.run(),请执行以下操作:

.../example$ iex -S mix

iex(1)> Example.run
"Akash Manohar // @HashNuke"
:ok

或者,您可以将扩展名更改为.exs,然后使用以下代码运行代码:

.../example$ mix run lib/example.exs

另一方面,如果要mix test运行测试,则必须将测试放在测试目录中。例如:

defmodule ExampleTest do
  use ExUnit.Case

  use Hound.Helpers

  test "page title is correct" do
    Hound.start_session

    navigate_to "http://akash.im"
    #IO.inspect page_title()
    assert page_title() == "Akash Manohar // @HashNuke"  

    Hound.end_session 
  end


end

在猎犬exunit示例here中,hound_session()调用对我造成了错误:

  

15:06:33.736 [错误] GenServer Hound.SessionServer终止   **(RuntimeError)无法创建新会话:超时,请检查webdriver是否正在运行       (猎犬)lib / hound / session_server.ex:101:Hound.SessionServer.create_session / 2