Try the Google Structured Data Tool. Maybe you already have.
down in the lower right click on "learn more about this tool" and below is first part of that. You also have to wait about a week after adding rich snippets until the Google Bots index your page(s).
Prototype and Test Your Markup
Using the features of this site and the Structured Data Testing Tool,
you can prototype, test, and make on-the-fly adjustments to your
These steps describe a progressive approach to exploring and
Start in the Search Gallery. The Search gallery illustrates rich
Search results for key schema.org data types, which include Rich Cards
and Rich Snippets. Each example's button loads the markup directly in
the Structured Data Testing Tool (SDTT). Explore the Data Type
reference. Here you'll see all the data types open for
implementation—indicating required and recommended fields, and
providing markup examples that load directly in the SDTT. Use the
Structured Data Testing Tool.