One of Jest's philosophies is to provide an integrated "zero-configuration" experience.
We observed that when engineers are provided with ready-to-use tools, they end up writing more tests, which in turn results in more stable and healthy code bases.
Fast interactive watch mode runs only test files related to changed files and is optimized to give signal quickly.
Capture snapshots of React trees or other serializable values to simplify testing and to analyze how state changes over time.
Open source is a philosophy that promotes the free access and distribution of an end product, usually software or a program.