Jest for Tests’ Development
A fairly new Jest framework created by Facebook, Inc. is used for testing. It was relatively well received in the React community. There is a rather common opinion that it is intended exclusively for use with React, but this is completely untrue. The main advantage of this framework over other testing frameworks is the requirement of zero or minimal config to start working on the compilation of test tasks. It features a built-in assertion library and supports the use of mock functions or spies.