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/suspense-list.test.js |
unit
|
javascript | This Jest unit test verifies SuspenseList component behavior and rendering order in Preact’s compatibility layer. |
| compat/test/browser/suspense.test.js |
unit
|
javascript | This Jest unit test suite verifies Preact’s Suspense component functionality including lazy loading, lifecycle methods, and state management. |
| compat/test/browser/unmountComponentAtNode.test.js |
unit
|
javascript | This Jest unit test verifies the unmountComponentAtNode functionality in Preact’s React compatibility layer. |
| compat/test/browser/unstable_batchedUpdates.test.js |
unit
|
javascript | This Jest unit test verifies the behavior of unstable_batchedUpdates and flushSync functions in Preact’s compatibility layer. |
| compat/test/browser/useSyncExternalStore.test.js |
unit
|
javascript | This Jest unit test verifies useSyncExternalStore hook functionality and React compatibility in Preact’s compat layer. |
| debug/test/browser/component-stack.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s component stack trace generation and error reporting functionality in debug mode. |
| debug/test/browser/debug-hooks.test.js |
unit
|
javascript | This Jest unit test verifies proper hook usage constraints and error handling in Preact’s debug mode. |
| debug/test/browser/debug-suspense.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s Suspense component debugging functionality including lazy loading and PropTypes validation. |
| debug/test/browser/debug.options.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s debug options functionality across component lifecycle events and error handling scenarios. |
| hooks/test/browser/componentDidCatch.test.js |
unit
|
javascript | This Jest unit test verifies error boundary behavior and errorInfo propagation during hook cleanup in Preact components. |