Make render? check for content as well as headings

app/components/govuk_component/notification_banner.rb

@@ -24,7 +24,7 @@ def success?
   end
 
   def render?
-    headings.any?
+    headings.any? || content.present?
   end
 
   def title_tag

spec/components/govuk_component/notification_banner_spec.rb

@@ -15,7 +15,7 @@
 
   let(:kwargs) { { title: title } }
 
-  describe "rendering a notification banner" do
+  describe "rendering a notification banner with headings" do
     before do
       render_inline(GovukComponent::NotificationBanner.new(**kwargs)) do |nb|
         nb.slot(:heading, text: "omg")
@@ -196,4 +196,19 @@
       let(:block) { ->(banner) { banner.add_heading(text: "What a nice heading!") } }
     end
   end
+
+  describe "rendering a notification banner with arbitrary content" do
+    before do
+      render_inline(GovukComponent::NotificationBanner.new(**kwargs)) { additional_content }
+    end
+
+    let(:subject) { page }
+
+    specify "the extra banner with extra content is rendered" do
+      expect(subject).to have_css(".govuk-notification-banner > .govuk-notification-banner__content") do |content|
+        expect(content).to have_css("p", text: "The quick brown fox")
+        expect(content).to have_css("blockquote", text: "Jumped over the lazy dog")
+      end
+    end
+  end
 end