Detox (Test) failing

Bitrise Build Issue Report template

Description of the issue

I’m trying to get Detox to run. Builds and tests fine locally through the Bitrise-cli, but when I try to run detox test --configuration ios.sim.release --cleanup after successfully building on the platform I keep getting this error:

detox[10630] ERROR: [exec.js/EXEC_FAIL, #7] "/bin/cat /dev/null >/Users/vagrant/Library/Developer/CoreSimulator/Devices/68D1A658-61BF-424C-A633-DF6C3D6FEB0E/data/tmp/detox.last_launch_app_log.out 2>/Users/vagrant/Library/Developer/CoreSimulator/Devices/68D1A658-61BF-424C-A633-DF6C3D6FEB0E/data/tmp/detox.last_launch_app_log.err && SIMCTL_CHILD_DYLD_INSERT_LIBRARIES="/Users/vagrant/Library/Detox/ios/6f933fef7d06549e6accd46fdde434f6dd3576cd/Detox.framework/Detox" /usr/bin/xcrun simctl launch --stdout=/tmp/detox.last_launch_app_log.out --stderr=/tmp/detox.last_launch_app_log.err 68D1A658-61BF-424C-A633-DF6C3D6FEB0E com.App --args -detoxServer ws://localhost:49405 -detoxSessionId 8b851442-2503-9e51-6f29-248421c0d458" failed with code = 1, stdout and stderr:

detox[10630] ERROR: [exec.js/EXEC_FAIL, #7] com.App: -1

detox[10630] ERROR: [exec.js/EXEC_FAIL, #7] An error was encountered processing the command (domain=FBSOpenApplicationServiceErrorDomain, code=1):
The request to open "com.App" failed.
The request was denied by service delegate (SBMainWorkspace) for reason: NotFound ("Application "com.App" is unknown to FrontBoard").
Underlying error (domain=FBSOpenApplicationErrorDomain, code=4):
	The operation couldn’t be completed. Application "com.App" is unknown to FrontBoard.
	Application "com.App" is unknown to FrontBoard.

Immediately causing my tests to fail. I cannot reproduce this locally. Any help would be appreciated.


Standard Machine, Xcode 10.2.x, on macOS 10.14 (Mojave)

Which build Step causes the issue and which version of the step?

detox test --configuration ios.sim.release --cleanup


  • Does a “Rebuild” help? (You can trigger a rebuild from the Build’s page, by clicking the “Rebuild” button in the top right corner of a finished build) : YES/NO
  • Does a rebuild without caches help? (You can remove the Cache:Pull and Cache:Push steps temporarily to not to use the cache, or you can delete all the caches on the Settings tab of the app. : NO
  • Does the issue happen sporadically, or every time? : EVERYTIME
  • Does upgrading the build Step to the latest version help? : NO
  • When did the issue start? : Since introducing Detox

Local reproduction

Can it be reproduced on your own Mac/PC by following our local debug guide? Please follow at least the first section (“Testing with a full clean git clone”) to make sure to test the state of the code what will get when it does a git clone in the clean environment! If possible please note which sections you tried.

Local reproduction: Linux / Android (docker based) stack builds

_Can it be reproduced by running the build locally, after doing a new git clone of the repository into the /tmp directory and running the build from there with the Bitrise CLI ( )? No

If no, can it be reproduced with Docker (using the same docker images / environment we use on No

Related guide: ._

Hi @Alexandra.Moss!

Sorry to hear about this! Can you please also include an URL for a build where this issue is happening so we can check out the logs completely?

Hi @bitce!

Thank you for responding, it’s been a frustrating two weeks of trying to figure this out. I actually was able to fix the problem. For whatever reason bumping up the appsimutils version fixed it, with:

brew install applesimutils --HEAD

Builds are successful again.

1 Like

Awesome, great work! :slight_smile:

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