Back to Repositories

Preact Testing: Component Lifecycle and DOM Integration Tests

The preactjs/preact repository showcases a comprehensive testing approach focused on unit testing using Jest as the primary testing framework. The test suite contains 99 tests that thoroughly verify core functionality, component lifecycles, and DOM interactions. The tests demonstrate best practices for testing Preact components, with particular attention to DOM sibling detection, form element behaviors, and component lifecycle methods. Qodo Tests Hub provides developers with an organized view into these test implementations, making it easier to understand Preact's testing patterns and best practices. Through the platform, developers can explore real-world examples of component lifecycle testing, DOM manipulation verification, and state management validation. This practical insight helps teams adopt effective testing strategies for their own Preact applications while learning from established testing patterns.

Path	Test Type	Language	Description
hooks/test/browser/combinations.test.js	unit	javascript	This Jest unit test verifies complex hook combinations and interactions in Preact components including state management, effects, and context updates.
hooks/test/browser/errorBoundary.test.js	unit	javascript	This Jest unit test verifies error boundary functionality and recovery mechanisms in Preact hooks.
hooks/test/browser/useContext.test.js	unit	javascript	This Jest unit test verifies the useContext hook functionality and context value management in Preact components.
hooks/test/browser/useEffect.test.js	unit	javascript	This Jest unit test verifies useEffect hook behavior including execution timing, cleanup, and error handling in Preact components.
hooks/test/browser/useEffectAssertions.test.js	unit	javascript	This Jest unit test verifies useEffect hook behavior and lifecycle management in Preact components.
hooks/test/browser/useId.test.js	unit	javascript	This Jest unit test verifies the useId hook’s ability to generate and maintain unique identifiers across component renders in Preact applications.
hooks/test/browser/useLayoutEffect.test.js	unit	javascript	This Jest unit test verifies the useLayoutEffect hook’s synchronous execution, cleanup, and error handling in Preact components.
hooks/test/browser/useRef.test.js	unit	javascript	This Jest unit test verifies the stability and initialization behavior of Preact’s useRef hook implementation.
hooks/test/browser/useReducer.test.js	unit	javascript	This Jest unit test verifies useReducer hook functionality including state management, dispatch behavior, and context integration in Preact components.
hooks/test/browser/useState.test.js	unit	javascript	This Jest unit test verifies the functionality and behavior of Preact’s useState hook implementation including initialization, updates, and component interactions.