What is snapshot testing and how does it work?

What is snapshot testing and how does it work?

Snapshot testing is a testing method that captures the output of a component and saves it as a reference. When the component changes, the output is compared to the saved snapshot to identify any differences.

What are the benefits of using snapshot testing?

The benefits include catching unexpected changes, simplifying the testing process, and providing a clear visual representation of component output.

Can you give me an example of snapshot testing in React?

Sure! In React, you can use Jest to create a snapshot test by rendering a component and calling toMatchSnapshot(). This saves the rendered output as a snapshot.

Are there any drawbacks to snapshot testing?

Yes, drawbacks include the potential for false positives if snapshots are not updated correctly, and they can become cumbersome if overused.

How often should I update my snapshots?

You should update your snapshots whenever there are intentional changes to the component's output, ensuring they reflect the current state.