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.
- If you are using Mocha, AVA or Tape, you can automatically migrate with Jest Codemods (see below).
- 如果你喜欢 chai，你可以升级Jest并继续使用chai。 However, we recommend trying out Jest's assertions and their failure messages. Jest Codemods can migrate from chai (see below).
jest-codemods #
If you are using Mocha, AVA, chai 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 transform your existing tests, navigate to the project containing the tests and run:
jest-codemodsMore information can be found at https://github.com/skovhus/jest-codemods.