Fix PHPStan issue: Parameter #1 $kernel of class Symfony\Bundle\Frame…

…workBundle\Console\Application constructor expects Symfony\Component\HttpKernel\KernelInterface, Symfony\Component\HttpKernel\KernelInterface|null given

tests/Command/AbstractCommandTest.php

@@ -15,6 +15,7 @@
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Tester\CommandTester;
+use Symfony\Component\HttpKernel\KernelInterface;
 
 abstract class AbstractCommandTest extends KernelTestCase
 {
@@ -33,7 +34,9 @@ protected function executeCommand(array $arguments, array $inputs = []): Command
         // this uses a special testing container that allows you to fetch private services
         /** @var Command $command */
         $command = static::getContainer()->get($this->getCommandFqcn());
-        $command->setApplication(new Application(self::$kernel));
+        /** @var KernelInterface $kernel */
+        $kernel = self::$kernel;
+        $command->setApplication(new Application($kernel));
 
         $commandTester = new CommandTester($command);
         $commandTester->setInputs($inputs);