Il exécute une transformation de code sur votre base de code en utilisant jscodeshift. Migrating to Jest If you'd like to try out Jest with an existing codebase, there are a number of ways to convert to Jest: If you are using Jasmine, or a Jasmine like API (for example Mocha ), Jest should be mostly compatible and easy to migrate to. enzyme is retained for testing React… – I thought, and decided to just as quickly try to see if the jet with the mocha will take off in the form of a test runner. Mocha to jest migration for eslint packages * migrated mocha to jest * migrated mocha to jest - 2 * migrated mocha to jest - removed preversion hook from script * migrated mocha to jest - 3 * migrated mocha to jest - 4 * cleanup * review * review In the case where you are using AVA, Chai, Expect.js (by Automattic), Jasmine, Mocha, proxyquire, Should.js or Tape you can make use of the third-party jest-codemods to do most of the dirty migration work. Well then. Pretty easy... Just some slight config changes and find/replace some stuff. Learn how to write and run tests for your JavaScript programs using Mocha. jest-codemods . With the growing popularity and benefits of Jest, I decided to migrate away from Mocha. Migrating from Mocha and Sinon to Jest. Read Time ~ <5 minutes. When comparing Mocha vs Jest, the Slant community recommends Mocha for most people. Just some slight config changes and find/replace some stuff. I’m glad again with bored envy looking through the list of chips from awesome-jestI suddenly noticed jest-runner-mocha. Test-driven development (TDD) is one of the major ways this can be achieved. To enable this in versions smaller than 13.2.0, you need to add --experimental-modules when running Mocha. We also had to migrate our usage of proxyquire to Jest's (superior) built-in mocking capabilities. Luckily Jest actually works with most of mocha's globals so that migration was relatively simple. That's the migration! # Setup the project npm install # Run Mocha+chai tests npm run test:mocha # Run Jest tests npm run test:jest # Bonus point: test coverage with Jest npm run test:jest:coverage 9/11/2014 4 mins - tdd, javascript, jest-When developing front-end applications, my TDD tool belt consists of karma, mocha, sinon, and chai. to Jest's describe/test from mocha's describe/it The majority of the mechanical changes to tests are achieved through running jest-codemods. After getting that merged, a week or two later I migrated the old mocha UI tests. Jest Codemods can help you migrate from chai (see instructions below). This change migrates all the existing unit tests to Jest's global expect and matchers from chai's imported expect, asserts and matchers.

August 9, 2018 18 min read 5154. A quick and complete guide to Mocha testing. (Mocha will load ESM even in Node v10, but this is not officially supported. "That might work!"