You may have built an API in Symfony before. You may have even written some browser tests in Beta. Did you ever consider using Behat to write integration tests for your API? If not, you definitely should. The portability and reusability of Behat steps make it the perfect platform for API integration tests. The Symfony kernel integration for Behat and absence of JavaScript in an API makes this match made in heaven. Pull up a cloud and let me show you the pure awesomeness that is BDD API Development with Symfony and Behat.