Receiving the following exception (a couple of variations):
14:02:09 Fatal error: Class undefined: Wikimedia\Equivset\Equivset in /workspace/src/extensions/AbuseFilter/includes/parser/AbuseFilterParser.php on line 1337
14:02:09 Destructor threw an object exception: exception 'MWException' with message 'AbuseFilterParserTest::tearDown() must call parent::tearDown()' in /workspace/src/tests/phpunit/MediaWikiTestCase.php:158
14:02:09 Stack trace:
14:02:09 #0 (): MediaWikiTestCase->__destruct()
14:02:09 #1 {main}
14:02:09 Destructor threw an object exception: exception 'Wikimedia\Rdbms\DBAccessError' with message 'Database access has been disabled.' in /workspace/src/includes/libs/rdbms/loadbalancer/LoadBalancer.php:1101
14:02:09 Stack trace:
14:02:09 #0 /workspace/src/includes/libs/rdbms/loadbalancer/LoadBalancer.php(942): Wikimedia\Rdbms\LoadBalancer->reallyOpenConnection()
14:02:09 #1 /workspace/src/includes/libs/rdbms/loadbalancer/LoadBalancer.php(890): Wikimedia\Rdbms\LoadBalancer->openLocalConnection()
14:02:09 #2 /workspace/src/includes/libs/rdbms/loadbalancer/LoadBalancer.php(766): Wikimedia\Rdbms\LoadBalancer->openConnection()
14:02:09 #3 /workspace/src/includes/GlobalFunctions.php(2694): Wikimedia\Rdbms\LoadBalancer->getConnection()
14:02:09 #4 /workspace/src/extensions/CentralAuth/includes/CentralAuthHooks.php(1536): wfGetDB()
14:02:09 #5 /workspace/src/includes/Hooks.php(174): CentralAuthHooks::onUnitTestsBeforeDatabaseTeardown()
14:02:09 #6 /workspace/src/includes/Hooks.php(202): Hooks::callHook()
14:02:09 #7 /workspace/src/tests/phpunit/MediaWikiTestCase.php(1358): Hooks::run()
14:02:09 #8 /workspace/src/tests/phpunit/bootstrap.php(20): MediaWikiTestCase::teardownTestDB()
14:02:09 #9 (): MediaWikiPHPUnitBootstrap->__destruct()
14:02:09 #10 {main}and:
14:02:57 Fatal error: Class undefined: Wikimedia\Equivset\Equivset in /workspace/src/extensions/AbuseFilter/includes/parser/AbuseFilterParser.php on line 1275
14:02:57 Destructor threw an object exception: exception 'MWException' with message 'AbuseFilterParserTest::tearDown() must call parent::tearDown()' in /workspace/src/tests/phpunit/MediaWikiTestCase.php:159
14:02:57 Stack trace:
14:02:57 #0 (): MediaWikiTestCase->__destruct()
14:02:57 #1 {main}Noticed for quibble-vendor-mysql-hhvm-docker (example) when working with a completely unrelated security backport for REL1_31, REL1_32 and REL1_33. I manually merged these since the patch for master tested fine (and the patch was one line of unrelated code for an entirely separate extension.)