End-to-end (E2E) tests, positioned just below UI testing in the testing pyramid, ensure system sanity and integrity. E2E testing guarantees seamless interaction among system components by validating user scenarios, bolstering overall resilience and reliability. Individual components contribute to system functionality in the complex realm of modern software. While testing these components in isolation ensures stability at that level, it fails to guarantee overall system fulfillment. E2E testing addresses this by examining the system as a whole, replicating a production-like environment for comprehensive validation.