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Tests hang at coverage command #1423
Description
Steps to reproduce:
dart pub get
dart pub global activate coverage
dart test --file-reporter json:$HOME/test.json --coverage coverage
Result: the command hangs
Last message in terminal:
00:24 <span style="color:#859900">+140</span>: All tests passed!
Happens with preview release (^2.12) with latest published versions of Dart packages on Flutter channels dev, beta and master, e.g. https://github.com/dart-lang/glob/tree/1.2.0
Full command output
log.txt
Reacted by Felix Angelov, Moses Karunia, Taha Tesser, Stanislav Bondarenko, Mike, Vladimir Markov, Vlad Bondarenko, Kevin Suhajda, Chris Raastad and Kyohei Ito
Activity
mit-mit commentedon Feb 3, 2021
cc @jakemac53 @natebosch
helinanever commentedon Mar 10, 2021
@mit-mit This is still an issue. Many pub.green builds time out due to this (e.g. around 200 builds tested with Flutter 2.0.1).
jakemac53 commentedon Mar 10, 2021
I can't repro this for vm tests but I can repro it for web tests (tried in the glob package), cc @grouma
grouma commentedon Mar 11, 2021
I dug into this today. I found a fix but I don't know why. Basically coverage works to completion but the test process doesn't always exit. Note testing and coverage collection always works but just exiting is flaky. This is resolved if we add a
force: truehere. We probably didn't catch this in CI because we force exit due to similar issues here.cc @natebosch for thoughts on what's going on
traveling-developer commentedon Mar 18, 2021
@grouma this is still an issue. Using dart 2.12.2 and test 1.16.8
If I run
dart test --coverage="coverage"it never endsgrouma commentedon Mar 18, 2021
@yudansha is it flaky or does it alway fail?
traveling-developer commentedon Mar 18, 2021
@grouma for me it always hangs after all tests were run and does not end.
Both on my dev machine and on the build runner (using the google dart docker image).
grouma commentedon Mar 19, 2021
I'm not able to reproduce this with
pub run test --coverage=coverage. I am however able to reproduce this withdart test --coverage=coverage. @bkonyi can you take a look?aaronlademann-wf commentedon Jun 9, 2021
@grouma @bkonyi @jakemac53 I can also confirm that
pub run build_runner test --file-reporter json:foo/test-results.jsonpasses in certain situations for us at Workiva, while the exact same test suite hangs when runningdart run build_runner test --file-reporter json:foo/test-results.json. This is on Dart 2.13.0.Even when it doesn't hang completely - running
dart run build_runner testwith a file-reporter takes 4-5 times longer than it does when not using a file-reporter, whereaspub run build_runner testwith a file-reporter takes only about 2 times as long.Use pub to execute tests