Test Runner flicker error

Can you reproduce the problem with latest npm?

Yes

Description

Sometimes running yarn test or npm test causes the tests to run over and over again.

Expected behavior

The test runner should report on the last test run. The runner should not run the tests again until the source has been modified.

Actual behavior

The Tests run over and over again…

Environment

Run these commands in the project folder and fill in their results:

1. npm ls react-scripts (if you haven’t ejected): react-scripts@1.0.7
2. node -v: v8.1.0
3. npm -v: 5.0.3
4. yarn -v: v0.24.5

Then, specify:

1. Operating system: OSX
2. Browser and version: Terminal

Reproducible Demo

This issue occures after creating a new project and running the tests. I’ve been able to reproduce it several times… however, sometimes it does not happen and works as expected.

1. create-react-app <appname>
2. cd <appname>
3. yarn test

Sometimes this error happens, other times the test runner runs the test and waits until the source has been modified as expected. I am not exactly sure why?

[DavidUv]

Dropbox also causes this behavior when syncing files from the folder where the app is. It is most noticeable with a newly created app since dropbox has a lot of files to sync (node_modules…). You can:

• Wait for it to finish syncing
• Pause dropbox syncing
• Exclude folder from dropbox syncing (whole app folder or just node_modules)

[graemetmcdonough]

Seems as though the iCloud backups trigger the tests; as soon as anything happens to the files (namely backing up), the test are rerun by watchman.