Google provides a tool for testing your embedded microdata or Structured Data Markup, which you can find here - developers.google.com 
Structured Data Markup is a standard way to annotate your content so machines can understand it. When your web pages include structured data markup, Google (and other search engines) can use that data to index your content better, present it more prominently in search results, and surface it in new experiences like voice answers, maps, and Google Now.