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Jest · Module

assertions

Jest tests JavaScript code with test files and assertions. Install it as a development dependency, add a test script, and run the test command.

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Syntax

test(name, fn)
expect(value).toBe(expected)

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  • expect
  • toBe
  • Using Matchers
  • npm test
  • yarn test
  • sum.test.js

Source: Getting Started · Jest. Checked 2026-11-03.