Add more images to admin site customization

spec/system/site_customization/images_spec.rb

@@ -0,0 +1,23 @@
+require "rails_helper"
+
+describe "Site customization images" do
+  scenario "Custom favicon" do
+    create(:site_customization_image, name: "favicon", image: fixture_file_upload("favicon_custom.ico"))
+
+    visit root_path
+
+    expect(page).to have_css("link[rel='shortcut icon'][href$='favicon_custom.ico']", visible: :hidden)
+  end
+
+  scenario "Custom auth background" do
+    stub_const("#{SiteCustomization::Image}::VALID_IMAGES", { "auth_bg" => [260, 80] })
+    create(:site_customization_image,
+           name: "auth_bg",
+           image: fixture_file_upload("logo_header-260x80.png"))
+
+    visit new_user_session_path
+
+    expect(page).to have_css "[style*='background-image:'][style*='logo_header-260x80.png']"
+    expect(page).not_to have_css "[style*='auth_bg']"
+  end
+end