Spec coverage on Settings/ controllers specs (#24221)

spec/controllers/settings/preferences/appearance_controller_spec.rb

@@ -14,7 +14,16 @@ describe Settings::Preferences::AppearanceController do
   describe 'GET #show' do
     it 'returns http success' do
       get :show
+
       expect(response).to have_http_status(200)
     end
   end
+
+  describe 'PUT #update' do
+    it 'redirects correctly' do
+      put :update, params: { user: { setting_theme: 'contrast' } }
+
+      expect(response).to redirect_to(settings_preferences_appearance_path)
+    end
+  end
 end