A resilient testing suite for your application is crucial to ensure reliability and confidence when deploying code changes. However, it's equally important to simulate the behavior of your users to anticipate their interactions with your platform. Synthetic user testing, also known as synthetics, allows you to test how your users interact with your application in a controlled environment, simulating real-world scenarios. This type of testing can help identify unhappy paths and ensure robustness in your application. With tools like New Relic's synthetic monitoring options, developers can create and manage their own synthetic tests, gaining a deeper technical understanding of how these tests work, which enhances their appreciation for the capabilities offered by New Relic. Ultimately, incorporating a robust synthetic testing suite into your testing framework is essential for creating confidence in your code as you continue refactoring and introducing new features.