How to run Jest tests with Yarn without any prompts?

jest --coverage report html
jest run single test
jest reporters
react-scripts test no watch
npm run test
yarn test single file
running testing

I am trying to run my Jest unit tests in Team City but I always end up getting the prompt as shown below.

No tests found related to files changed since last commit.
Press `a` to run all tests, or run Jest with `--watchAll`.

Watch Usage
 › Press a to run all tests.
 › Press f to run only failed tests.
 › Press p to filter by a filename regex pattern.
 › Press t to filter by a test name regex pattern.
 › Press q to quit watch mode.
 › Press Enter to trigger a test run.

I tried running yarn test a to run all the tests. But once the tests have completed execution, I'm still getting the same prompt. I tried yarn test a q but that doesn't work. I also tried yarn test a --forceExit and yarn test a --bail but nothing happens, I still get the prompt. How can I run all my Jest tests without getting this prompt as there will be no interaction when running through Team City? Any help would be much appreciated.

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.

How to run Jest tests with Yarn without any prompts?, Running Jest defaults to prompting for input (i.e., a for running all the tests, q for quit, etc.). If the current Flag for forcing Jest to run all tests without prompt #​1788. Closed @gustavjf you can run with CI=true yarn test  The jest command line runner has a number of useful options. You can run jest --help to view all available options. Many of the options shown below can also be used together to run tests exactly the way you want. Every one of Jest's Configuration options can also be specified through the CLI. Here is a brief overview: Running from the command line.


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

Flag for forcing Jest to run all tests without prompt · Issue #1788 , testsfound related to files changed since the last git commit. Finally, run yarn test or npm run test and Jest will print this message: PASS ./sum.test.js adds 1 + 2 to equal 3 (5ms) You just successfully wrote your first test using Jest! This test used expect and toBe to test that two values were exactly identical. To learn about the other things that Jest can test, see Using Matchers. Running from command line

yarn test --coverage

Will run only once (with coverage) and returns 0 on success and 1 on failure.

How do I run a single test using Jest?, Runs the test script defined by the package. yarn test. If you have defined a scripts object in your package, this command will run the specified test script. and run your tests by executing yarn test in your shell. Now, you don’t have any tests here, so nothing is going to be executed: Let’s create the first test. Open a math.js file and type a couple functions that we’ll later test:

Use Jest's Interactive Watch Mode from @kentcdodds on @eggheadio, If you run Jest via yarn test , you can pass the command line arguments directly as Jest Deletes the Jest cache directory and then exits without running tests. Let’s run our tests again with yarn test command in lieu of our changes. Jest matched the existing snapshots against the rendered component with the updated changes and failed because there were some additions to our component. It then shows a diff of the changes that are introduced to the snapshot tests.

Track project code coverage with Jest from @kentcdodds on , The following packages will be required in order to write the test code and run the of the DOM tree rendered by a React DOM without using a browser To install we run yarn test from the command line, it will prompt Jest to find the test code  I'm using the jest-junit package for test reports (which has been worked on more recently than the jest-trx-results-processor, fwiw): Add jest-junit to package.json. Eg yarn add -D jest-junit or npm add --save-dev jest-junit. Add a VSTS task to run Jest using the jest-junit results reporter. I used the Yarn task, but you can alternately use the

yarn test, Install Jest using [`yarn`]( Finally, run yarn test or npm run test and Jest will print this message: PASS ./sum.test.js ✓ adds  So to run a single test, there are two approaches: Option 1: If your test name is unique, you can enter t while in watch mode and enter the name of the test you'd like to run. Option 2: Hit p while in watch mode to enter a regex for the filename you'd like to run.

  • did you try to pass --ci option?
  • @SeniorPomidor I tried "yarn test --ci" and "yarn test a --ci". But neither of them work :(
  • oh. yarn... try ` --silent`
  • Still no luck, getting the same prompt. Guess I'll have to add the ci true thing to my package json. Because that works.
  • oh. glad to help you. as I said changing package.json is alternative solution
  • I tried "yarn test --ci" and "yarn test a --ci". But I'm still getting the same prompt. Is there another way that'd work without making any changes to the package json?
  • This will still cause the command to hang if no files have been changed since the last commit. The difference is that it will create a coverage folder under the project, and print some more information.