Fix DoctrineSelectableDynamicReturnTypeExtensionTest

It uses transitively uses reflection provider from
ReflectionProviderStaticAccessor which is properly
initialized by ContainerFactory::postInitializeContainer

Author: xificurk

tests/Type/Doctrine/DoctrineSelectableDynamicReturnTypeExtensionTest.php

@@ -7,19 +7,24 @@
 use PhpParser\Node\Expr\MethodCall;
 use PHPStan\Analyser\Scope;
 use PHPStan\Reflection\MethodReflection;
+use PHPStan\Testing\PHPStanTestCase;
 use PHPStan\Type\ObjectType;
 use PHPStan\Type\Type;
 use PHPStan\Type\VerbosityLevel;
-use PHPUnit\Framework\TestCase;
 
-final class DoctrineSelectableDynamicReturnTypeExtensionTest extends TestCase
+final class DoctrineSelectableDynamicReturnTypeExtensionTest extends PhpStanTestCase
 {
 
 	private DoctrineSelectableDynamicReturnTypeExtension $extension;
 
+	public static function getAdditionalConfigFiles(): array
+	{
+		return [__DIR__ . '/../../../extension.neon'];
+	}
+
 	protected function setUp(): void
 	{
-		$this->extension = new DoctrineSelectableDynamicReturnTypeExtension();
+		$this->extension = self::getContainer()->getByType(DoctrineSelectableDynamicReturnTypeExtension::class);
 	}
 
 	/**