Objective-C Travis failed for 'Test runner exited before starting test execution' - objective-c

Question

Here is my code in .travis.yml file，after run build is passing, but I found the TEST are failed. I have no idea about this and block me a few days, appreciate your help. THX
--- Error as below ---
2018-12-20 05:57:42.698 xcodebuild[2394:8186] [MT]
IDETestOperationsObserverDebug: (CB8F382A-5B77-4BDA-BC4F-6EDF7B7DB822)
Beginning test session aaaaTests-CB8F382A-5B77-4BDA-BC4F-6EDF7B7DB822 at 2018-
12-20 05:57:42.698 with Xcode 10A255 on target <DVTiPhoneSimulator:
0x7f86387e49d0> {
SimDevice: iPhone 6 (B25EC6DB-0B2F-4920-B6C2-8560331BA779, iOS 9.1, Booted)
} (9.1 (13B143))
2018-12-20 05:57:53.744 xcodebuild[2394:8186] [MT]
IDETestOperationsObserverDebug: 11.068 elapsed -- Testing started completed.
2018-12-20 05:57:53.744 xcodebuild[2394:8186] [MT]
IDETestOperationsObserverDebug: 0.000 sec, +0.000 sec -- start
2018-12-20 05:57:53.744 xcodebuild[2394:8186] [MT]
IDETestOperationsObserverDebug: 11.068 sec, +11.068 sec -- end
2018-12-20 05:57:53.746 xcodebuild[2394:8186] Error
Domain=IDETestOperationsObserverErrorDomain Code=6 "Early unexpected exit,
operation never finished bootstrapping - no restart will be attempted"
UserInfo={NSLocalizedDescription=Early unexpected exit, operation never
finished bootstrapping - no restart will be attempted,
NSUnderlyingError=0x7f86389df930 {Error
Domain=IDETestOperationsObserverErrorDomain Code=5 "Test runner exited before
starting test execution." UserInfo={NSLocalizedDescription=Test runner exited
before starting test execution., NSLocalizedRecoverySuggestion=If you believe
this error represents a bug, please attach the result bundle at
/Users/travis/Library/Developer/Xcode/DerivedData/aaaa-
bdscsxnorhzvygafnsqdiqoriugx/Logs/Test/Run-aaaa-2018.12.20_05-57-22-
+0000.xcresult}}}
Testing failed:
aaaa.app (2488) encountered an error (Early unexpected exit, operation never finished bootstrapping - no restart will be attempted. Underlying error: Test runner exited before starting test execution.)
** TEST FAILED **
The command "set -o pipefail && xcodebuild -workspace aaaa.xcworkspace -scheme aaaa -destination platform\=iOS\ Simulator,OS\=9.1,name\=iPhone\ 6 build test | xcpretty" exited with 65.
Done. Your build exited with 1.
---My code as below---
language: objective-c
osx_image: xcode10
xcode_workspace: aaaa.xcworkspace
xcode_scheme: aaaa
xcode_destination: platform=iOS Simulator,OS=9.1,name=iPhone 6
before_install:
- pod repo update
- npm install ios-sim -g
- ios-sim start --devicetypeid "com.apple.CoreSimulator.SimDeviceType.iPhone-6, 9.1"

Answer 1

The issue can fix by below step:
change the version of osx_image in .travis.yml file and retry
// if xcode10.1 build failed, you can change to other version, like xcode9.4
osx_image: xcode10.1
Travis support xcode version list:
https://docs.travis-ci.com/user/languages/objective-c/