Karma
Karma is a test runner for JavaScript that executes code in real browsers, enabling developers to test their applications across multiple environments. It integrates with popular testing frameworks like Jasmine, Mocha, and QUnit to automate unit and integration testing. By spawning browsers and running tests, it provides immediate feedback on code changes, supporting continuous integration workflows.
Developers should use Karma when building JavaScript applications that require cross-browser testing to ensure compatibility and reliability. It is particularly valuable for front-end development in frameworks like Angular, where it is the default test runner, and for projects needing automated testing in CI/CD pipelines. Learning Karma helps catch bugs early by running tests in actual browsers rather than simulated environments.