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migration-guide
Migration Guide
docs
Quick Start
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api

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.
  • If you are using AVA or tape, you can automatically migrate with Jest Codemods (see below).
  • If you like chai, you can upgrade to Jest and continue using chai. However, we recommend trying out Jest's assertions and their failure messages.

jest-codemods

If you are using AVA or Tape, you can use the third-party jest-codemods to do most of the dirty migration work. It runs a code transformation on your codebase using jscodeshift.

Install Jest Codemods with npm by running:

npm install -g jest-codemods

To get transform your existing tests, navigate to the project containing the tests and run:

jest-codemods

More information can be found at https://github.com/skovhus/jest-codemods.