Liveview testing: cannot mount view with "/" path

Phoenix Forum Questions / Help
, ,
1

I am trying to mount a liveview in a test based on documentation examples:

  test "GET /", %{conn: _conn} do
    conn = get(conn, "/")
    {:ok, view, html} = live(conn)
  end

The liveview is defined at the root of my website, with “/” path set in the router:

  scope "/", HelloWeb do
    pipe_through :browser    
    live "/", Main.MainLive, session: [:user_id, :action, :current_user]    
  end

But running the test produces the error below (full stack at the end of the post):

(FunctionClauseError) no function clause matching in String.split/3

However, if I change the path of the Liveview from “/” to anything else, eg. “/test” in both test and router, this error does not occur.
This looks to me like a bug in the testing framework but I am not sure since I am new to phoenix and elixir.

Does anybody know or have any hints on how to test a Liveview defined at the “/” path?

Thanks.

Error stack:

** (FunctionClauseError) no function clause matching in String.split/3
    (elixir) lib/string.ex:407: String.split(nil, "/", [])
    (phoenix) lib/phoenix/router.ex:887: Phoenix.Router.route_info/4
    (phoenix_live_view) lib/phoenix_live_view/utils.ex:127: Phoenix.LiveView.Utils.live_link_info!/3
    (phoenix_live_view) lib/phoenix_live_view/channel.ex:168: Phoenix.LiveView.Channel.maybe_call_mount_handle_params/2
    (phoenix_live_view) lib/phoenix_live_view/channel.ex:523: Phoenix.LiveView.Channel.verified_mount/4
    (phoenix_live_view) lib/phoenix_live_view/channel.ex:32: Phoenix.LiveView.Channel.handle_info/2
    (stdlib) gen_server.erl:637: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:711: :gen_server.handle_msg/6
    (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3
Last message: {:mount, Phoenix.LiveView.Channel}


  1) test GET / (HelloWeb.Main.NavbarLiveTest)
     test/hello_web/live/main/navbar_live_test.exs:7
     ** (FunctionClauseError) no function clause matching in String.split/3

     The following arguments were given to String.split/3:

         # 1
         nil

         # 2
         "/"

         # 3
         []

     Attempted function clauses (showing 4 out of 4):

         def split(string, -%Regex{} = pattern-, options) when -is_binary(string)-
         def split(string, -""-, options) when -is_binary(string)-
         def split(string, pattern, []) when -is_tuple(pattern)- or -is_binary(string)-
         def split(string, pattern, options) when -is_binary(string)-

     stacktrace:
       (elixir) lib/string.ex:407: String.split/3
       (phoenix) lib/phoenix/router.ex:887: Phoenix.Router.route_info/4
       (phoenix_live_view) lib/phoenix_live_view/utils.ex:127: Phoenix.LiveView.Utils.live_link_info!/3
       (phoenix_live_view) lib/phoenix_live_view/channel.ex:168: Phoenix.LiveView.Channel.maybe_call_mount_handle_params/2
       (phoenix_live_view) lib/phoenix_live_view/channel.ex:523: Phoenix.LiveView.Channel.verified_mount/4
       (phoenix_live_view) lib/phoenix_live_view/channel.ex:32: Phoenix.LiveView.Channel.handle_info/2
       (stdlib) gen_server.erl:637: :gen_server.try_dispatch/4
       (stdlib) gen_server.erl:711: :gen_server.handle_msg/6
       (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3
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