Top Jest Interview Questions!

What is Jest?

Developed by Facebook, it is a powerful JavaScript testing framework for developers to write robust and reliable tests for their JavaScript applications

How is Jest different from other testing frameworks?

Jest accelerates testing with parallel execution, mocking, snapshot comparisons, and coverage analysis.

How to install and set up Jest?

Install Jest, configure via jest.config.js, then run tests using 'jest' command.

How to write a simple test using Jest?

Create test file, define test case, use Jest's matchers, run test.

How to test asynchronous code in Jest?

Jest handles asynchronous code tests via async/await, done callback, expect API.

How does Jest handle dependencies in testing?

Jest handles dependencies via mocking, isolating code for focused testing.

What are the best practices when testing with Jest?

Write focused tests, use mocks, update snapshots, aim for high coverage.