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/cloneElement.test.js |
unit
|
javascript | This Jest unit test verifies cloneElement functionality in Preact’s compatibility layer, ensuring proper element cloning and children handling. |
| compat/test/browser/compat.options.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s compatibility options through component lifecycle, event handling, and state management testing. |
| compat/test/browser/context.test.js |
unit
|
javascript | This Jest unit test verifies synchronous context propagation and state updates in Preact’s React compatibility layer. |
| compat/test/browser/isMemo.test.js |
unit
|
javascript | This Jest unit test verifies the isMemo utility function’s ability to correctly identify memoized components in Preact’s React compatibility layer. |
| compat/test/browser/createElement.test.js |
unit
|
javascript | This Jest unit test verifies createElement functionality and vnode normalization in Preact’s React compatibility layer. |
| compat/test/browser/createFactory.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s createFactory functionality for both DOM elements and components in the compat module. |
| compat/test/browser/exports.test.js |
unit
|
javascript | This Jest unit test verifies the complete API surface of Preact’s compatibility layer including core components, hooks, and client-specific functionality. |
| debug/test/browser/component-stack-2.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s component stack trace warnings when required JSX source plugins are missing. |
| compat/test/browser/isValidElement.test.js |
unit
|
javascript | This Jest unit test verifies the isValidElement function’s ability to correctly identify valid Preact and React elements while rejecting invalid inputs. |
| compat/test/browser/svg.test.js |
unit
|
javascript | This Jest unit test verifies SVG rendering functionality in Preact’s compatibility layer through string and DOM manipulation tests. |