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 |
|---|---|---|---|
| compat/test/browser/textarea.test.js |
unit
|
javascript | This Jest unit test verifies textarea component behavior in Preact’s React compatibility layer, including value handling and hydration. |
| debug/test/browser/debug-compat.test.js |
unit
|
javascript | This Jest unit test verifies Preact debug module’s compatibility features including portal rendering and PropTypes validation. |
| debug/test/browser/debug.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s debug functionality including error handling, component validation, and development tools integration. |
| hooks/test/browser/useDebugValue.test.js |
unit
|
javascript | This Jest unit test verifies the useDebugValue hook functionality and formatting capabilities in Preact components. |
| debug/test/browser/serializeVNode.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s virtual node serialization functionality for components and props in debug mode. |
| devtools/test/browser/addHookName.test.js |
unit
|
javascript | This Jest unit test verifies the addHookName functionality in Preact’s devtools for proper hook name assignment and options API integration. |
| debug/test/browser/validateHookArgs.test.js |
unit
|
javascript | This Jest unit test verifies proper validation of NaN arguments across various Preact hooks implementations. |
| test/browser/getDomSibling.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s getDomSibling function for accurate DOM sibling node detection across various component structures and scenarios. |
| hooks/test/browser/useCallback.test.js |
unit
|
javascript | This Jest unit test verifies the memoization behavior of Preact’s useCallback hook through dependency tracking and callback recomputation. |
| hooks/test/browser/hooks.options.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s hook options system functionality including lifecycle methods and effect handling. |