DEV: initial system tests for chat and plugins (#18881)

This is a very basic to ensure it's working and open future possible work

plugins/chat/app/models/category_channel.rb

@@ -17,7 +17,11 @@ class CategoryChannel < ChatChannel
     category.secure_group_ids.to_a.concat(staff_groups)
   end
 
-  def title(_)
+  def title(_ = nil)
     name.presence || category.name
   end
+
+  def slug
+    title.truncate(100).parameterize
+  end
 end

plugins/chat/plugin.rb

@@ -619,7 +619,7 @@ after_initialize do
     get "/browse/archived" => "chat#respond"
     get "/draft-channel" => "chat#respond"
     get "/channel/:channel_id" => "chat#respond"
-    get "/channel/:channel_id/:channel_title" => "chat#respond"
+    get "/channel/:channel_id/:channel_title" => "chat#respond", :as => "channel"
     get "/channel/:channel_id/:channel_title/info" => "chat#respond"
     get "/channel/:channel_id/:channel_title/info/about" => "chat#respond"
     get "/channel/:channel_id/:channel_title/info/members" => "chat#respond"
@@ -697,12 +697,7 @@ after_initialize do
 
   add_api_key_scope(
     :chat,
-    {
-      create_message: {
-        actions: %w[chat/chat#create_message],
-        params: %i[chat_channel_id],
-      },
-    },
+    { create_message: { actions: %w[chat/chat#create_message], params: %i[chat_channel_id] } },
   )
 
   # Dark mode email styles

plugins/chat/spec/system/navigation_spec.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+RSpec.describe "Navigation", type: :system, js: true do
+  fab!(:user) { Fabricate(:user) }
+  fab!(:category_channel) { Fabricate(:category_channel) }
+  fab!(:message) { Fabricate(:chat_message, chat_channel: category_channel) }
+
+  before do
+    SiteSetting.chat_enabled = true
+    SiteSetting.chat_allowed_groups = Group::AUTO_GROUPS[:everyone]
+  end
+
+  context "when visiting /chat" do
+    before do
+      category_channel.add(user)
+      sign_in(user)
+    end
+
+    it "it opens full page" do
+      visit("/chat")
+
+      expect(page).to have_current_path(
+        chat.channel_path(category_channel.id, category_channel.slug),
+      )
+      expect(page).to have_css("html.has-full-page-chat")
+      expect(page).to have_css(".chat-message-container[data-id='#{message.id}']")
+    end
+  end
+end