How to run Jest tests with Yarn without any prompts?
yarn test --coverage
Will run only once (with coverage) and returns 0 on success and 1 on failure.
In TeamCity, edit the setting for your configuration, then select Parameters on the side.
Click Add a new Parameter, and in the dialog popup that appears, under Kind: select Environment variable (env.).
Set the name to env.CI and set the value to true. Click Save.
Next time you run your build, your build should auto-run the tests and move on.
For bonus points (and if you are the administrator) go to Administration then under Projects edit the <Root project>. Click Parameters on the side and set the env.CI parameter to true so you don't have to set this for future projects.
--ci
When this option is provided, Jest will assume it is running in a CI environment. This changes the behavior when a new snapshot is encountered. Instead of the regular behavior of storing a new snapshot automatically, it will fail the test and require Jest to be run with --updateSnapshot. link
Also, you can change package.json to:
"test": "CI=true react-scripts test --env=jsdom",
which works great.
Your other option is to set CI in the command like any variable:
CI=true yarn test
The following command worked for me.
CI=true yarn test