$ vendor/bin/phpunit
PHPUnit 7.0.2 by Sebastian Bergmann and contributors.

Testing 
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ESSSSSSSSSEEEEESSSSPHP Fatal error:  Uncaught TypeError: Return value of PHPUnit\Framework\TestCase::getTestResultObject() must be an instance of PHPUnit\Framework\TestResult, null returned in /www/doctrine/dbal/vendor/phpunit/phpunit/src/Framework/TestCase.php:918
Stack trace:
#0 /www/doctrine/dbal/vendor/symfony/phpunit-bridge/Legacy/SymfonyTestsListenerTrait.php(182): PHPUnit\Framework\TestCase->getTestResultObject()
#1 /www/doctrine/dbal/vendor/symfony/phpunit-bridge/Legacy/SymfonyTestsListenerForV7.php(55): Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerTrait->startTest(Object(PHPUnit\Framework\WarningTestCase))
#2 /www/doctrine/dbal/vendor/phpunit/phpunit/src/Framework/TestResult.php(394): Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerForV7->startTest(Object(PHPUnit\Framework\WarningTestCase))
#3 /www/doctrine/dbal/vendor/phpunit/phpunit/src/Framework/TestResult.php(647): PHPUnit\Framework\TestResult->startTest(Object(PHPUnit\Framework\WarningTestCase))
#4 /www/doctrine/dbal/vendor/phpunit/phpunit/src/Framework/TestCase.php(679): PH in /www/doctrine/dbal/vendor/phpunit/phpunit/src/Framework/TestCase.php on line 918