Jest

Jest is a JavaScript testing framework designed to ensure the correctness of any JavaScript codebase. According to the Jest Core Team, it provides an approachable, familiar, and feature-rich API for writing tests and delivers results quickly. Jest is said to be suitable for companies of all sizes, from small startups to large enterprises. It caters to a wide range of professions and industries, including software developers, quality assurance engineers, web development agencies, e-commerce companies, and SaaS companies.