Until earlier today, the job was broken because xdebug was not configured, see example for tools/codesniffer:
```
+ exec docker run --entrypoint=php --workdir=/src --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/src:/src --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/cache:/cache --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/log:/log --security-opt seccomp=unconfined --init --rm --label jenkins.job=phpunit-coverage-php74-docker-publish --label jenkins.build=14 --env-file /dev/fd/63 docker-registry.wikimedia.org/releng/composer-php74:0.2.0-s9 -d zend_extension=xdebug.so ./vendor/bin/phpunit --coverage-clover /log/coverage/clover.xml --coverage-html /log/coverage
++ /usr/bin/env
++ egrep -v '^(HOME|SHELL|PATH|LOGNAME|MAIL)='
PHPUnit 8.5.30 [44;37m#StandWith[0m[43;30mUkraine[0m
Error: XDEBUG_MODE=coverage or xdebug.mode=coverage has to be set
........................................................ 56 / 56 (100%)
Time: 56 ms, Memory: 6.00 MB
```
I don't know for how long it's been broken, but https://doc.wikimedia.org/cover/mediawiki-tools-codesniffer/ had this at the bottom:
> Generated by php-code-coverage 7.0.15 using PHP 7.2.34-18+0~20210223.60+debian10~1.gbpb21322+wmf3 with Xdebug 2.7.0 and PHPUnit 8.5.27 at Thu Jul 14 1:38:25 UTC 2022.
So probably a long time.
Now the job uses pcov, which we did as part of T269489. However, there are some differences in the output:
```
+ exec docker run --entrypoint=php --workdir=/src --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/src:/src --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/cache:/cache --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/log:/log --security-opt seccomp=unconfined --init --rm --label jenkins.job=phpunit-coverage-php74-docker-publish --label jenkins.build=24 --env-file /dev/fd/63 docker-registry.wikimedia.org/releng/composer-php74:0.2.0-s9 -d extension=pcov.so -d pcov.enable=1 ./vendor/bin/phpunit --coverage-clover /log/coverage/clover.xml --coverage-html /log/coverage
++ /usr/bin/env
++ egrep -v '^(HOME|SHELL|PATH|LOGNAME|MAIL)='
PHPUnit 8.5.30 #StandWithUkraine
Error: Package phpunit/php-invoker is required for enforcing time limits
............................................................... 63 / 106 ( 59%)
........................................... 106 / 106 (100%)
Time: 4.34 seconds, Memory: 24.00 MB
```
Most notably:
- Number of tests went from 56 to 106.
- PHPUnit now complains about missing php-invoker. This is expected if the PHPUnit config enables time limits but the package is not installed.
Additionally, the job is failing for mediawiki-libs-Minify:
```
+ exec docker run --entrypoint=php --workdir=/src --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/src:/src --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/cache:/cache --volume /srv/jenkins/workspace/phpunit-coverage-php74-docker-publish/log:/log --security-opt seccomp=unconfined --init --rm --label jenkins.job=phpunit-coverage-php74-docker-publish --label jenkins.build=25 --env-file /dev/fd/63 docker-registry.wikimedia.org/releng/composer-php74:0.2.0-s9 -d extension=pcov.so -d pcov.enable=1 ./vendor/bin/phpunit --coverage-clover /log/coverage/clover.xml --coverage-html /log/coverage
++ /usr/bin/env
++ egrep -v '^(HOME|SHELL|PATH|LOGNAME|MAIL)='
PHPUnit 8.5.30 [44;37m#StandWith[0m[43;30mUkraine[0m
............................................................... 63 / 842 ( 7%)
............................................................... 126 / 842 ( 14%)
...........................E................................... 189 / 842 ( 22%)
............................................................... 252 / 842 ( 29%)
............................................................... 315 / 842 ( 37%)
............................................................... 378 / 842 ( 44%)
............................................................... 441 / 842 ( 52%)
............................................................... 504 / 842 ( 59%)
............................................................... 567 / 842 ( 67%)
............................................................... 630 / 842 ( 74%)
............................................................... 693 / 842 ( 82%)
............................................................... 756 / 842 ( 89%)
............................................................... 819 / 842 ( 97%)
....................... 842 / 842 (100%)
Time: 424 ms, Memory: 18.00 MB
There was 1 error:
1) CliTest::testRunJsFile
PHPUnit\Framework\Exception: PHP Fatal error: Uncaught SebastianBergmann\CodeCoverage\RuntimeException: No code coverage driver available in /src/vendor/phpunit/php-code-coverage/src/CodeCoverage.php:907
Stack trace:
#0 /src/vendor/phpunit/php-code-coverage/src/CodeCoverage.php(147): SebastianBergmann\CodeCoverage\CodeCoverage->selectDriver()
#1 Standard input code(302): SebastianBergmann\CodeCoverage\CodeCoverage->__construct()
#2 Standard input code(512): __phpunit_run_isolated_test()
#3 {main}
thrown in /src/vendor/phpunit/php-code-coverage/src/CodeCoverage.php on line 907
Fatal error: Uncaught SebastianBergmann\CodeCoverage\RuntimeException: No code coverage driver available in /src/vendor/phpunit/php-code-coverage/src/CodeCoverage.php:907
Stack trace:
#0 /src/vendor/phpunit/php-code-coverage/src/CodeCoverage.php(147): SebastianBergmann\CodeCoverage\CodeCoverage->selectDriver()
#1 Standard input code(302): SebastianBergmann\CodeCoverage\CodeCoverage->__construct()
#2 Standard input code(512): __phpunit_run_isolated_test()
#3 {main}
thrown in /src/vendor/phpunit/php-code-coverage/src/CodeCoverage.php on line 907
phpvfscomposer:///src/vendor/phpunit/phpunit/phpunit:97
```
This task has the goal of investigating these failures and determing what caused them, and how they should be fixed.