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 |
|---|---|---|---|
| test/browser/keys.test.js |
unit
|
javascript | This Jest unit test verifies key-based rendering and state management functionality in Preact components. |
| test/browser/lifecycles/componentDidCatch.test.js |
unit
|
javascript | This Jest unit test verifies the componentDidCatch lifecycle method functionality and error boundary behavior in Preact components. |
| test/browser/lifecycles/componentWillMount.test.js |
unit
|
javascript | This Jest unit test verifies componentWillMount lifecycle behavior and state management in Preact components. |
| test/browser/lifecycles/componentWillUnmount.test.js |
unit
|
javascript | This Jest unit test verifies the componentWillUnmount lifecycle method behavior for top-level Preact components. |
| test/browser/lifecycles/componentDidUpdate.test.js |
unit
|
javascript | This Jest unit test verifies the componentDidUpdate lifecycle method functionality in Preact components including state management, prop updates, and component rendering sequence. |
| test/browser/lifecycles/lifecycle.test.js |
unit
|
javascript | This Jest unit test verifies Preact component lifecycle method execution order, state management, and DOM timing behaviors. |
| test/browser/lifecycles/shouldComponentUpdate.test.js |
unit
|
javascript | This Jest unit test verifies shouldComponentUpdate lifecycle behavior and component rerendering optimization in Preact components. |
| test/browser/placeholders.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s null placeholder handling and component state preservation mechanisms. |
| test/browser/refs.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s ref system functionality including creation, updates, and cleanup across component lifecycles. |
| test/browser/render.test.js |
unit
|
javascript | This Jest unit test verifies Preact’s core rendering functionality including DOM manipulation, component lifecycle, and attribute handling. |