CRA 2.x > 3.0 upgrade - test script with --watchAll=false never exits in docker build

Is this a bug report?

Yes

Did you try recovering your dependencies?

Created fresh brand new CRA app and reproduced

Which terms did you search for in User Guide?

docker, test

Environment

Environment Info:

System: OS: macOS 10.14.4 CPU: (4) x64 Intel® Core™ i7-7567U CPU @ 3.50GHz Binaries: Node: 10.15.1 - ~/.nvm/versions/node/v10.15.1/bin/node Yarn: Not Found npm: 6.4.1 - ~/.nvm/versions/node/v10.15.1/bin/npm Browsers: Chrome: 73.0.3683.103 Firefox: 66.0.3 Safari: 12.1 npmPackages: react: ^16.8.6 => 16.8.6 react-dom: ^16.8.6 => 16.8.6 react-scripts: 3.0.0 => 3.0.0 npmGlobalPackages: create-react-app: Not Found

Original issue found on a shared gitlab pipeline runner

Steps to Reproduce

1. Add watchAll=false to test script
2. Add npm test in a Dockerfile stage
3. Run docker build .

Expected Behavior

Docker should continue to the next step after running the test script

Actual Behavior

> docker-test@0.1.0 test /app
> react-scripts test --watchAll=false

PASS src/App.test.js
  ✓ renders without crashing (45ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        2.247s
Ran all test suites.

Never continues

Reproducible Demo

https://github.com/bvalyou/create-react-app-docker-test-issue

Clone, run docker build . - reaches test script and never continues

In my main project the CI build timed out after one hour

[bvalyou]

That worked, thanks! Maybe we should add a note to the breaking changes list for 3.0 that the CI env variable is now required for test builds to work on docker.

[bugzpodder]

Fixed as part of 3.1 release.