We recommend snapshot testing for components, to verify their stability, correct rending, and avoid unexpected changes.
A snapshot should be considered valid only when the component has been visually inspected and verified that it renders correctly, both in storybook and in the browser.
If a snapshot test fails, investigate the nature of the change and determine whether it was intentional or not.
Update the snapshot if the change was intentional and reflects the new expected behavior. If the change was unintentional, address the change appropriately.
Here are some common mistakes when performing snapshot testing.
Perform snapshot testing only after finalizing the layout and styling of the component. Testing too early may result in frequent snapshot updates as these aspects evolve.
Snapshot testing is not suitable for dynamic content because it may result in frequent updates and test failures. Use alternative testing approaches for dynamic content.
Consider the impact of application theme changes on snapshot testing. Application theme changes cause the snapshot to fail in components where these changes are being used.