DEV: Add system test for soft loading topic search results (#25525)

Follow up to: https://github.com/discourse/discourse/pull/25504

spec/system/page_objects/pages/search.rb

@@ -8,6 +8,15 @@ module PageObjects
         self
       end
 
+      def type_in_search_menu(input)
+        find("input#search-term").send_keys(input)
+        self
+      end
+
+      def click_search_menu_link
+        find(".search-menu .results .search-link").click
+      end
+
       def clear_search_input
         find("input.full-page-search").set("")
         self
@@ -29,8 +38,16 @@ module PageObjects
         find(".d-header #search-button").click
       end
 
+      def click_first_topic
+        find(".topic-list-body tr:first-of-type").click
+      end
+
       SEARCH_RESULT_SELECTOR = ".search-results .fps-result"
 
+      def has_topic_title_for_first_search_result?(title)
+        page.has_css?(".search-menu .results .search-result-topic", text: title)
+      end
+
       def has_search_result?
         page.has_selector?(SEARCH_RESULT_SELECTOR)
       end

spec/system/search_spec.rb

@@ -85,4 +85,26 @@ describe "Search", type: :system do
       expect(search_page).to have_warning_message
     end
   end
+
+  describe "when search menu on desktop" do
+    before do
+      SearchIndexer.enable
+      SearchIndexer.index(topic, force: true)
+      SearchIndexer.index(topic2, force: true)
+    end
+
+    after { SearchIndexer.disable }
+
+    it "still displays last topic search results after navigating away, then back" do
+      visit("/")
+      search_page.click_search_icon
+      search_page.type_in_search_menu("test")
+      search_page.click_search_menu_link
+      expect(search_page).to have_topic_title_for_first_search_result(topic.title)
+
+      search_page.click_first_topic
+      search_page.click_search_icon
+      expect(search_page).to have_topic_title_for_first_search_result(topic.title)
+    end
+  end
 end