So, after some more time/issues, I figured that my phpunit/phpunit bundle version was to old (9.*) and so I updated it to works with dama/doctrine-test-bundle (need phpunit version > 10).
But in the end, I removed dama/doctrine-test-bundle and used hautelook/alice-bundle.
I had to add this code in my /test/bootstrap.php to create the db and the schema.
$appKernel = new Kernel('test', false);
$appKernel->boot();
$application = new Application($appKernel);
$application->setCatchExceptions(false);
$application->setAutoExit(false);
$application->run(new ArrayInput([
'command' => 'doctrine:database:drop',
'--force' => '1',
]));
$application->run(new ArrayInput([
'command' => 'doctrine:database:create',
]));
$application->run(new ArrayInput([
'command' => 'doctrine:schema:create',
]));
$appKernel->shutdown();
And added use ReloadDatabaseTrait;
at the beginning of my TestClass.