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/useImperativeHandle.test.js |
unit
|
javascript | This Jest unit test verifies the useImperativeHandle hook’s ref manipulation and lifecycle behavior in Preact components. |
| hooks/test/browser/useMemo.test.js |
unit
|
javascript | This Jest unit test verifies the useMemo hook’s memoization behavior and dependency tracking in Preact components. |
| test/browser/lifecycles/getDerivedStateFromProps.test.js |
unit
|
javascript | This Jest unit test verifies the getDerivedStateFromProps lifecycle method functionality in Preact components. |
| test-utils/test/shared/rerender.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s setupRerender and teardown utilities for proper component rerendering and state management. |
| test/browser/components.test.js |
unit
|
javascript | This Jest unit test suite verifies core component functionality in the Preact framework including lifecycle methods, state management, and component relationships. |
| test/browser/context.test.js |
unit
|
javascript | This Jest unit test verifies context propagation and lifecycle interactions in Preact components. |
| test/browser/lifecycles/componentWillReceiveProps.test.js |
unit
|
javascript | This Jest unit test verifies the componentWillReceiveProps lifecycle method behavior and execution order in Preact components. |
| test/browser/lifecycles/getDerivedStateFromError.test.js |
unit
|
javascript | This Jest unit test verifies the getDerivedStateFromError lifecycle method functionality and error boundary behavior in Preact components. |
| test/shared/isValidElement.test.js |
unit
|
javascript | This Preact unit test verifies the isValidElement function’s ability to correctly identify and validate Preact element objects. |
| test/browser/lifecycles/componentDidMount.test.js |
unit
|
javascript | This Jest unit test verifies componentDidMount lifecycle behavior and setState callback execution in Preact components. |