Failing test for #580 turbo frame responses missing tracked elements

test/dummy/app/controllers/tabs_controller.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class TabsController < ApplicationController
+  def index; end
+  def show
+    render locals: { name: params[:id] }
+  end
+end

test/dummy/app/views/tabs/index.html.erb

@@ -0,0 +1,11 @@
+<h1>Tabs</h1>
+
+<nav>
+  <ul>
+    <% %w[one two three].each do |name| %>
+      <li><%= link_to "Tab #{name}", tab_path(name), data: { turbo_frame: "tabs" } %>
+    <% end %>
+  </ul>
+</nav>
+
+<%= turbo_frame_tag "tabs", src: tab_path("one"), data: {turbo_action: "advance"} %>

test/dummy/app/views/tabs/show.html.erb

@@ -0,0 +1,3 @@
+<%= turbo_frame_tag "tabs" do %>
+  Tab <%= name %> content
+<% end %>

test/dummy/config/routes.rb

@@ -7,6 +7,7 @@
       get :section
     end
   end
+  resources :tabs
   resources :trays
   resources :posts
   resources :notifications

test/system/frames_test.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+#
+require "application_system_test_case"
+
+class FramesTest < ApplicationSystemTestCase
+  test "browser history navigation with turbo frames" do
+    visit tabs_url
+
+    assert_selector "h1", text: "Tabs"
+
+    assert_selector "turbo-frame", text: "Tab one content"
+    assert_current_path tabs_path
+
+    click_on "Tab two"
+
+    assert_selector "turbo-frame", text: "Tab two content"
+    assert_current_path tab_path("two")
+
+    page.go_back
+
+    assert_selector "turbo-frame", text: "Tab one content" # fails as of Turbo 8
+    assert_current_path root_path
+
+    page.go_forward
+
+    assert_selector "turbo-frame", text: "Tab two content"
+    assert_current_path tab_path("two")
+
+    # we haven't modified the rest of the page (restoration visit)
+    assert_selector "h1", text: "Tabs" # fails as of Turbo 8
+  end
+end