Add dataset schema to other types

The national_statistics, official_statistics and transparency document types
also contain datasets so will benefit from better structured data.

app/presenters/publication_presenter.rb

@@ -20,6 +20,10 @@ def national_statistics?
     document_type == "national_statistics"
   end
 
+  def dataset?
+    %(national_statistics official_statistics transparency).include? document_type
+  end
+
 private
 
   def documents_list

app/views/content_items/publication.html.erb

@@ -1,6 +1,6 @@
 <% content_for :extra_head_content do %>
   <%= machine_readable_metadata(
-    schema: :article
+    schema: (@content_item.dataset? ? :dataset : :article)
   ) %>
 <% end %>
 

test/integration/publication_test.rb

@@ -29,6 +29,8 @@ class PublicationTest < ActionDispatch::IntegrationTest
       },
     )
 
+    assert_has_structured_data(page, "Article")
+
     assert_footer_has_published_dates("Published 3 May 2016")
   end
 
@@ -63,6 +65,11 @@ class PublicationTest < ActionDispatch::IntegrationTest
     assert page.has_css?('img[alt="National Statistics"]')
   end
 
+  test "national statistics publication has correct structured data" do
+    setup_and_visit_content_item("statistics_publication")
+    assert_has_structured_data(page, "Dataset")
+  end
+
   test "renders 'Applies to' block in important metadata when there are excluded nations" do
     setup_and_visit_content_item("statistics_publication")
 

test/test_helper.rb

@@ -183,6 +183,10 @@ def visit_with_cachebust(visit_uri)
     visit(uri)
   end
 
+  def assert_has_structured_data(page, schema_name)
+    assert find_structured_data(page, schema_name).present?
+  end
+
   def find_structured_data(page, schema_name)
     schema_sections = page.find_all("script[type='application/ld+json']", visible: false)
     schemas = schema_sections.map { |section| JSON.parse(section.text(:all)) }