What are three reasons that a developer should write Jest tests for Lightning web components? Choose 3 answers

Jest tests are essential for developing Lightning Web Components (LWC) because they allow

developers to ensure the quality and correctness of their components in isolation from the rest of

the application. Reason A is incorrect because testing non-public properties breaks encapsulation

and is considered bad practice. B is correct because Jest tests can simulate user interactions with the

component, such as clicking buttons or entering text, to ensure it behaves as expected. C is correct as

well because Jest tests can confirm that the component renders the expected DOM output, which is

crucial for ensuring that the HTML structure of the component is accurate. D is not the best choice

since Jest is more suited for testing components in isolation rather than how multiple components

interact; integration tests are more appropriate for that. Lastly, E is correct because Jest tests can

verify that events are fired at the appropriate times, which is a critical part of the component's

interaction with the rest of the application.

Reference

Jest Testing: Lightning Web Components Testing

Jest Testing Best Practices: Lightning Web Components Jest Best Practices