It has a couple of advantages compared to vanilla Jasmine
- Automatically finds tests to execute in your repo
- Automatically mocks dependencies for you 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 run on the command line
- Runs tests in parallel processes so that they finish sooner
For more information about Jest see the official Jest homepage.