Render history notice for historically_political html attachments

This does the work to ensure that if a html attachment is historically
political then the history notice banner is rendered like it is for
various other document types such as News Articles.

app/presenters/html_publication_presenter.rb

@@ -2,6 +2,7 @@ class HtmlPublicationPresenter < ContentItemPresenter
   include ContentItem::Body
   include ContentItem::OrganisationBranding
   include ContentItem::ContentsList
+  include ContentItem::Political
 
   def isbn
     content_item["details"]["isbn"]

app/views/content_items/html_publication.html.erb

@@ -42,6 +42,7 @@
   <p class="publication-header__last-changed"><%= @content_item.last_changed %></p>
 <% end %>
 
+<%= render 'shared/history_notice', content_item: @content_item %>
 <%= render 'govuk_publishing_components/components/notice', @content_item.withdrawal_notice_component  %>
 
 <div

test/integration/html_publication_test.rb

@@ -74,6 +74,14 @@ def assert_has_component_organisation_logo_with_brand(brand, index = 1)
     end
   end
 
+  test "historically political html publication" do
+    setup_and_visit_html_publication("published_with_history_mode")
+
+    within ".govuk-notification-banner__content" do
+      assert page.has_text?("This was published under the 2010 to 2015 Conservative and Liberal Democrat coalition government")
+    end
+  end
+
   test "withdrawn html publication" do
     content_item = GovukSchemas::Example.find("html_publication", example_name: "prime_ministers_office")
     content_item["withdrawn_notice"] = {

test/presenters/html_publication_presenter_test.rb

@@ -5,6 +5,10 @@ def schema_name
     "html_publication"
   end
 
+  test "includes political" do
+    assert presented_item("published").is_a?(ContentItem::Political)
+  end
+
   test "presents the basic details of a content item" do
     assert_equal schema_item("published")["schema_name"], presented_item("published").schema_name
     assert_equal schema_item("published")["links"]["parent"][0]["document_type"], presented_item("published").format_sub_type