<https://travis-ci.org/wikimedia/mediawiki/jobs/342150461>
```counterexample
There was 1 error:
1) MWDebugTest::testAppendDebugInfoToApiResultXmlFormat
PHPUnit_Framework_Exception: Argument #2 (No Value) of PHPUnit_Framework_Assert::assertArrayHasKey() must be a array or ArrayAccess
/home/travis/build/wikimedia/mediawiki/tests/phpunit/includes/debug/MWDebugTest.php:110
/home/travis/build/wikimedia/mediawiki/tests/phpunit/MediaWikiTestCase.php:420
/home/travis/build/wikimedia/mediawiki/maintenance/doMaintenance.php:94
```
See also:
* T182368 (same test failing, but due to a different error)
It seems this only happens when enabling these three configuration variables, per <https://gerrit.wikimedia.org/r/#/c/412830/6/includes/DevelopmentSettings.php>
```lang=php
// Enable verbose logging
$wgDebugComments = true;
$wgDebugDumpSql = true;
$wgDebugTimestamps = true;
```
It seems that enabling any one or two of these, does not make the tests fail, only all three.