Karma

Karma is an open-source productive testing environment. It allows a QA to perform tests for an application in different environments.

Karma provides an environment for developers where no configuration setup is needed. Instead, they can just run the tests and get instant feedback. This framework also provides testing on real browsers and devices like phones and tablets.

Some of its other pros include:

• You can control the entire workflow directly from your IDE or CMD
• You can describe tests with popular frameworks like Mocha, Jasmine, and also write a simple adapter for a specific framework
• Supports continuous integration and deployment (CI/CD) using Jenkins, Semaphore or Travis
• Big community

When it comes to cons, there are not any significant ones to consider, and that is why Karma is considered to be one of the best testing frameworks for JavaScript.