Add page count

Add page_count to downloadable media so that it accurately reflects the size of the file

app/views/markup/_downloadable_media.html.slim

@@ -23,4 +23,4 @@ section.gem-c-attachment class='govuk-!-display-none-print govuk-!-margin-bottom
 
       = ', '
       span.gem-c-attachment__attribute
-        | 1 page
+        = page_count

config/initializers/markdown.rb

@@ -12,19 +12,20 @@ def apply_all
   #   605 KB
   #   //assets.ctfassets.net/xxx.pdf
   #   //images.ctfassets.net/xxx.png
+  #   2 pages
   #   {/download}
   #
   # @return [CustomPreprocessor]
   def download
     pattern = build_regexp('download')
     @output = output.gsub(pattern) do
-      file_title, file_size, pdf_url, thumb_url = *Regexp.last_match(1).strip.split("\n")
-
+      file_title, file_size, pdf_url, thumb_url, pdf_pages = *Regexp.last_match(1).strip.split("\n")
       download_template.render(nil,
                                file_title: file_title,
                                file_size: file_size,
                                pdf_url: pdf_url,
-                               thumb_url: thumb_url)
+                               thumb_url: thumb_url,
+                               page_count: page_count)
     end
     self
   end

spec/helpers/content_helper_spec.rb

@@ -96,6 +96,24 @@
         expect(html).to include 'title="This is a video title"'
       end
     end
+
+    describe 'Downloads' do
+      let(:input) do
+        <<~MARKUP
+        {download}
+        title
+        size
+        pdf_url_text
+        thumb_url_text
+        2 Pages
+        {/download}
+        MARKUP
+      end
+
+      it 'has pages' do
+        expect(html).to include '2 Pages'
+      end
+    end
   end
 
   describe 'Not found error' do