Summary

Congratulations! You are now ready to build high-quality FastAPI applications that have been well tested. In this chapter, you learned how to use pytest, a powerful and efficient testing framework for Python. Thanks to pytest fixtures, you saw how to create a reusable test client for your FastAPI application that can work asynchronously. Using this client, you learned how to make HTTP requests to assert the behavior of your REST API. Finally, we reviewed how to test WebSocket endpoints, which involves a fairly different way of thinking.

Now that you can build a reliable and efficient FastAPI application, it's time to bring it to the whole world! In the next chapter, we'll review the best practices and patterns for preparing a FastAPI application for the world before studying several deployment methods.