1 Built on top of the Jasmine test framework, using familiar expect(value).toBe(other) assertions
2 DOM APIs are mocked and tests run in parallel via a small node.js command line utility
3 Jest provides you with multiple layers on top of Jasmine:
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@developerfarm: "Jest | Painless JavaScript Unit Testing" http://t.co/VDeQJk4C9f 자바스크립트 단위 테스트 도구