In Chapter 6 , we saw how generative AI can boost developer productivity by automatically suggesting code snippets and even generating unit tests. But testing doesn’t stop at the function level. Modern software increasingly depends on multiservice architectures, dynamic user flows, and complex integrations—all of which require functional and integration testing to ensure a reliable end-to-end experience. This is where AI-driven testing tools—like Functionaize—come into play, offering advanced capabilities that automate or augment the creation, maintenance, and execution of more complex tests.