UX: displays channel title in document title (#21242)

plugins/chat/spec/system/document_title_spec.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+RSpec.describe "Document title", type: :system, js: true do
+  fab!(:current_user) { Fabricate(:user) }
+
+  let(:chat_page) { PageObjects::Pages::Chat.new }
+
+  context "when visiting a public channel" do
+    fab!(:channel_1) { Fabricate(:category_channel) }
+
+    before do
+      chat_system_bootstrap
+      channel_1.add(current_user)
+      sign_in(current_user)
+    end
+
+    it "shows the channel name in the document title" do
+      chat_page.visit_channel(channel_1)
+
+      expect(page.title).to start_with("##{channel_1.title}")
+    end
+  end
+
+  context "when visiting a direct message channel" do
+    fab!(:channel_1) { Fabricate(:direct_message_channel, users: [current_user]) }
+
+    before do
+      chat_system_bootstrap
+      channel_1.add(current_user)
+      sign_in(current_user)
+    end
+
+    it "shows the channel name in the document title" do
+      chat_page.visit_channel(channel_1)
+
+      expect(page.title).to start_with("#{channel_1.title(current_user)}")
+    end
+  end
+end