Assert_patch on route with query params?

Phoenix Forum Questions / Help
,
1

We’re patching to a LiveView but assert_patch doesn’t seem to like it. We’re patching to the same route /, but changing the query params.

How can we assert on patch?

Minimally Reproducible Example:

# live view
defmodule PushingParamsWeb.ParamsLive do
  use PushingParamsWeb, :live_view

  def mount(_params, _session, socket) do
    {:ok, socket}
  end

  def handle_params(%{"my_param" => "true"} = params, _uri, socket) do
    if connected?(socket) do
      {:noreply, push_patch(socket, to: ~p"/")}
    else
      {:noreply, socket}
    end
  end

  def handle_params(_params, _uri, socket) do
    {:noreply, socket}
  end

  def render(assigns) do
    ~H"""
    Some homepage
    """
  end
end

and test:

defmodule ParamsLiveTest do
  use PushingParamsWeb.ConnCase, async: true

  import Phoenix.LiveViewTest

  describe "push patch" do
    test "remove param", %{conn: conn}  do
      {:ok, live, _html} = live(conn, "/?my_param=true")
      assert_patch live, "/"
    end
  end
end

and error:

  1) test push patch remove param (ParamsLiveTest)
     test/pushing_params_web/live/params_live_test.exs:7
     ** (ArgumentError) expected PushingParamsWeb.ParamsLive to patch to "/", but got none
     code: assert_patch live, "/"
     stacktrace:
       (phoenix_live_view 0.19.5) lib/phoenix_live_view/test/live_view_test.ex:1361: Phoenix.LiveViewTest.assert_navigation/4
       (phoenix_live_view 0.19.5) lib/phoenix_live_view/test/live_view_test.ex:1254: Phoenix.LiveViewTest.assert_patch/3
       test/pushing_params_web/live/params_live_test.exs:9: (test)