Testing two environments with jest

Question

I'd like to set two different environments and be able to run both in watch mode.

|-- /server |     |-- index.js  <-  Node |-- /client |     |-- index.js  <-  jsdom |-- package.json 

Actually I run jest twice for each environment, providing a different config file for each:

$ yarn test -- --config=server.config.json $ yarn test -- --config=client.config.json  

But this doesn't let me run both at the same time.

Answer 1

EDIT (Jan 2018):

It is now possible to do so (since Jest v20), and the option is called projects. Read more about it the docs.

Basically you can define an array of your projects you want Jest to be run within:

{   "projects": ["<rootDir>/client", "<rootDir>/server", "<rootDir>/some-glob/*"] } 

Just remember every project needs to have its own config. If you want the config to be picked up automatically, put it inside jest.config.js file or like usually in package.json.

If you prefer placing your config somewhere else (e.g. in configs/jest.js), you'll need to point to the path of the config file (with the rootDir option set properly):

{   "projects": ["<rootDir>/client/configs/jest.js", "<rootDir>/server/configs/jest.js"] } 

ORIGINAL ANSWER:

Currently this is not possible, but there's an issue for that case: https://github.com/facebook/jest/issues/1206.

Feel free to jump in and leave a comment!