Add QA tests for the performance bar60356-add-qa-tests-for-the-performance-bar

These are very high-level. Currently, they test:

1. That the performance bar appears.
2. That it has detailed metrics for Postgres and Gitaly.
3. That AJAX requests are included in the request selector.

3 files changed, 59 insertions, 0 deletions

diff --git a/qa/qa/page/admin/menu.rb b/qa/qa/page/admin/menu.rb
index 25564f2dc6e..eea5717f5a7 100644
--- a/qa/qa/page/admin/menu.rb
+++ b/qa/qa/page/admin/menu.rb
@@ -10,6 +10,7 @@ module QA
           element :admin_settings_item
           element :admin_settings_repository_item
           element :admin_settings_general_item
+          element :admin_settings_metrics_and_profiling_item
         end
 
         def go_to_repository_settings
@@ -28,6 +29,14 @@ module QA
           end
         end
 
+        def go_to_metrics_and_profiling_settings
+          hover_settings do
+            within_submenu do
+              click_element :admin_settings_metrics_and_profiling_item
+            end
+          end
+        end
+
         private
 
         def hover_settings
diff --git a/qa/qa/page/admin/settings/component/performance_bar.rb b/qa/qa/page/admin/settings/component/performance_bar.rb
new file mode 100644
index 00000000000..bc29efb64c0
--- /dev/null
+++ b/qa/qa/page/admin/settings/component/performance_bar.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module QA
+  module Page
+    module Admin
+      module Settings
+        module Component
+          class PerformanceBar < Page::Base
+            view 'app/views/admin/application_settings/_performance_bar.html.haml' do
+              element :enable_performance_bar_checkbox
+              element :save_changes_button
+            end
+
+            def enable_performance_bar
+              click_element :enable_performance_bar_checkbox
+              Capybara.current_session.driver.browser.manage.add_cookie(name: 'perf_bar_enabled', value: 'true')
+            end
+
+            def save_settings
+              click_element :save_changes_button
+            end
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/qa/qa/page/admin/settings/metrics_and_profiling.rb b/qa/qa/page/admin/settings/metrics_and_profiling.rb
new file mode 100644
index 00000000000..e10a92d7a54
--- /dev/null
+++ b/qa/qa/page/admin/settings/metrics_and_profiling.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module QA
+  module Page
+    module Admin
+      module Settings
+        class MetricsAndProfiling < Page::Base
+          include QA::Page::Settings::Common
+
+          view 'app/views/admin/application_settings/metrics_and_profiling.html.haml' do
+            element :performance_bar_settings
+          end
+
+          def expand_performance_bar(&block)
+            expand_section(:performance_bar_settings) do
+              Component::PerformanceBar.perform(&block)
+            end
+          end
+        end
+      end
+    end
+  end
+end