Описание тега jestjs
Jest is a JavaScript unit testing framework made by Facebook based on Jasmine and provides automated mock creation and a jsdom environment. It's often used for testing React components.
It has a couple of advantages compared to vanilla jasmine
- Automatically finds tests to execute in your source code
- Automatically mocks dependencies when running your tests
- Allows you to test asynchronous code synchronously
- Runs your tests with a fake DOM implementation (via jsdom) so that your tests can be run on the command line
- Runs tests in parallel processes so that they finish sooner