EYCDTK-55 Accessible iframe update (#880)

* Update video markup to support title

* Update logic for video markdown

app/views/markup/_video.html.slim

@@ -1,2 +1,2 @@
 p.embed-container
-  iframe src=url allow='accelerometer; autoplay; fullscreen; clipboard-write; encrypted-media; gyroscope; picture-in-picture'
+  iframe title=video_title src=url allow='accelerometer; autoplay; fullscreen; clipboard-write; encrypted-media; gyroscope; picture-in-picture'

config/initializers/markdown.rb

@@ -136,17 +136,20 @@ def blockquote
   end
 
   # @example
-  #   {video}872080640{/video}
+  #   {video}
+  #   video
+  #   This is a video title
+  #   {/video}
   #
   # @return [CustomPreprocessor]
   def video
     pattern = build_regexp('video')
     @output = output.gsub(pattern) do
       params = { enablejsapi: 1, origin: ENV['DOMAIN'] }.to_param
-      video_id = Regexp.last_match(1)
+      video_id, video_title = split_content Regexp.last_match(1)
       video_url = %(https://www.youtube.com/embed/#{video_id}?#{params})
       # video_url = %(https://player.vimeo.com/video/#{video_id}?#{params})
-      video_template.render(nil, url: video_url)
+      video_template.render(nil, url: video_url, video_title: video_title)
     end
     self
   end

spec/helpers/content_helper_spec.rb

@@ -77,6 +77,25 @@
         end
       end
     end
+
+    describe 'Video markup' do
+      let(:input) do
+        <<~MARKUP
+          {video}
+          video
+          This is a video title
+          {/video}
+        MARKUP
+      end
+
+      it 'renders the embedded video' do
+        expect(html).to have_selector('iframe')
+      end
+
+      it 'renders an iframe with a title' do
+        expect(html).to include 'title="This is a video title"'
+      end
+    end
   end
 
   describe 'Not found error' do