DEV: adds spec for deleted message (#20317)

plugins/chat/spec/system/chat_channel_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe "Chat channel", type: :system, js: true do
 
       it "loads most recent messages" do
         unloaded_message = Fabricate(:chat_message, chat_channel: channel_1)
-        visit("/chat/message/#{message_1.id}")
+        visit("/chat/c/-/#{channel_1.id}/#{message_1.id}")
 
         expect(channel).to have_no_loading_skeleton
         expect(page).to have_no_css("[data-id='#{unloaded_message.id}']")

plugins/chat/spec/system/deleted_message_spec.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+RSpec.describe "Deleted message", type: :system, js: true do
+  let(:chat_page) { PageObjects::Pages::Chat.new }
+  let(:channel_page) { PageObjects::Pages::ChatChannel.new }
+
+  fab!(:current_user) { Fabricate(:user) }
+  fab!(:channel_1) { Fabricate(:category_channel) }
+  fab!(:message_1) { Fabricate(:chat_message, chat_channel: channel_1, user: current_user) }
+
+  before do
+    chat_system_bootstrap
+    channel_1.add(current_user)
+    sign_in(current_user)
+  end
+
+  context "when deleting a message" do
+    it "shows as deleted" do
+      chat_page.visit_channel(channel_1)
+      expect(channel_page).to have_no_loading_skeleton
+
+      channel_page.expand_message_actions(message_1)
+      find("[data-value='deleteMessage']").click
+
+      expect(page).to have_content(I18n.t("js.chat.deleted"))
+    end
+  end
+end