Latest phpStorm IDE complains about missing ext-json in composer.json. Added.

1 job for F7904RestAPIExportviaForm in 2 minutes and 6 seconds (queued for 1 second)
Name Stage Failure
failed
snapshot Test There is an unknown failure, please try again
/home/gitlab-runner/builds/7e3e234d/0/typo3/qfq/typo3conf/ext/qfq/Source/core/helper/OnString.php:220
/home/gitlab-runner/builds/7e3e234d/0/typo3/qfq/typo3conf/ext/qfq/Tests/unit/core/helper/OnStringTest.php:121
.

ERRORS!
Tests: 319, Assertions: 1826, Errors: 1, Failures: 2.
Makefile:121: recipe for target 'phpunit' failed
make: *** [phpunit] Error 2
ERROR: Job failed: exit status 1