use Drupal\Component\Serialization\Yaml;
use Drupal\Component\Serialization\YamlPecl;
use Drupal\Component\Serialization\YamlSymfony;
-use Drupal\Tests\UnitTestCase;
+use PHPUnit\Framework\TestCase;
/**
* @coversDefaultClass \Drupal\Component\Serialization\Yaml
* @group Serialization
*/
-class YamlTest extends UnitTestCase {
+class YamlTest extends TestCase {
/**
* @var \PHPUnit_Framework_MockObject_MockObject