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/forwardRef.test.js |
unit
|
javascript | This Jest unit test verifies forwardRef functionality in Preact’s React compatibility layer, ensuring proper ref forwarding and component behavior. |
| compat/test/browser/hooks.test.js |
unit
|
javascript | This Jest unit test verifies React 18 hooks implementation and context management in Preact’s compatibility layer. |
| compat/test/browser/hydrate.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s hydration functionality for React-compatible JSX rendering and callback handling. |
| compat/test/browser/isFragment.test.js |
unit
|
javascript | This Jest unit test verifies Fragment detection functionality across Preact’s native and compatibility implementations. |
| compat/test/browser/memo.test.js |
unit
|
javascript | This Jest unit test verifies the functionality of Preact’s memo() higher-order component for component memoization and optimization. |
| compat/test/browser/portals.test.js |
unit
|
javascript | This Jest unit test verifies Portal functionality in Preact’s compatibility layer, ensuring proper component rendering across different DOM nodes. |
| compat/test/browser/render.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s React compatibility layer render functionality and DOM attribute handling. |
| compat/test/browser/scheduler.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s scheduler functionality for priority-based task execution and timestamp generation. |
| compat/test/browser/select.test.js |
unit
|
javascript | This Jest unit test verifies multiple selection handling in Preact’s Select component compatibility layer. |
| compat/test/browser/suspense-hydration.test.js |
unit
|
javascript | This Jest unit test verifies Preact Suspense component hydration behavior including DOM preservation, event handling, and state management. |