A naukri.com initiative
Dev
4w
419
Image Credit: Dev
How to test if a mocked component receives the correct props in Jest and RTL (new since React 19)
- To test if a mocked component receives the correct props in Jest and RTL (since React 19), the approach has changed.
- Initially, set up a simple example with a
component that takes an array of names, calling a component. - In testing, mock the
component and verify its invocation to ensure proper isolation. - When testing props, a new test checks if
was called with the correct props in React 19. - In React 19, the second argument is now required to be undefined while it used to be an empty object {} pre-React 19.
- A practical example demonstrates the usage of expect.objectContaining to accurately validate props.
- An improvement suggestion is to utilize expect.objectContaining for testing specific props while allowing flexibility for other properties.
- Understanding the changes in React 19 regarding the second argument for prop validation in mocked components is vital for accurate testing.
- Ensure tests are updated post-React 19 to align with the new requirement of using undefined as the second argument for prop validation.
- The article emphasizes the importance of adapting testing approaches to changes in React to maintain accurate component testing.
Read Full Article
25 Likes
For uninterrupted reading, download the app