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, Expect.js (by Automattic), Jasmine, Mocha, proxyquire, Should.js 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).
If you are using AVA, Chai, Expect.js (by Automattic), Jasmine, Mocha, proxyquire, Should.js 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:
More information can be found at https://github.com/skovhus/jest-codemods.