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 |
|---|---|---|---|
| jsx-runtime/test/browser/jsx-runtime.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s JSX Runtime implementation including transformation, component rendering, and entity encoding functionality. |
| test-utils/test/shared/act.test.js |
unit
|
javascript | This Jest unit test verifies the act() utility’s handling of component rendering, state updates, and effect execution in Preact applications. |
| test/browser/cloneElement.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s cloneElement functionality for component cloning, props merging, and special prop handling. |
| test/browser/customBuiltInElements.test.js |
unit
|
javascript | This Jest unit test verifies the proper creation and lifecycle handling of customized built-in elements in Preact components. |
| test/browser/createContext.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s createContext API functionality including provider-consumer relationships, context propagation, and update behavior. |
| test/browser/events.test.js |
unit
|
javascript | This Jest unit test verifies event handling implementation and lifecycle management in Preact components. |
| test/browser/focus.test.js |
unit
|
javascript | This Jest unit test verifies focus management and text selection preservation in Preact components during various DOM manipulation scenarios. |
| test/browser/fragments.test.js |
unit
|
javascript | This Jest unit test verifies Fragment component rendering and state management in the Preact framework |
| test/browser/isValidElement.test.js |
unit
|
javascript | This Preact unit test verifies the isValidElement utility function’s ability to correctly identify valid Preact elements and components. |
| test/browser/hydrate.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s hydration functionality for server-side rendered components and DOM reuse. |