diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php
index a42003f35890..e6b9a60d1de8 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CacheMetadataFactoryTest.php
@@ -13,7 +13,9 @@
 
 use Symfony\Component\Cache\Adapter\ArrayAdapter;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
+use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\Mapping\Factory\CacheClassMetadataFactory;
+use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
 
 /**
  * @author Kévin Dunglas <dunglas@gmail.com>
@@ -22,9 +24,9 @@ class CacheMetadataFactoryTest extends \PHPUnit_Framework_TestCase
 {
     public function testGetMetadataFor()
     {
-        $metadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Dummy');
+        $metadata = new ClassMetadata(Dummy::class);
 
-        $decorated = $this->getMock('Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface');
+        $decorated = $this->getMock(ClassMetadataFactoryInterface::class);
         $decorated
             ->expects($this->once())
             ->method('getMetadataFor')
@@ -33,14 +35,14 @@ public function testGetMetadataFor()
 
         $factory = new CacheClassMetadataFactory($decorated, new ArrayAdapter());
 
-        $this->assertEquals($metadata, $factory->getMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\Dummy'));
+        $this->assertEquals($metadata, $factory->getMetadataFor(Dummy::class));
         // The second call should retrieve the value from the cache
-        $this->assertEquals($metadata, $factory->getMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\Dummy'));
+        $this->assertEquals($metadata, $factory->getMetadataFor(Dummy::class));
     }
 
     public function testHasMetadataFor()
     {
-        $decorated = $this->getMock('Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface');
+        $decorated = $this->getMock(ClassMetadataFactoryInterface::class);
         $decorated
             ->expects($this->once())
             ->method('hasMetadataFor')
@@ -49,7 +51,7 @@ public function testHasMetadataFor()
 
         $factory = new CacheClassMetadataFactory($decorated, new ArrayAdapter());
 
-        $this->assertTrue($factory->hasMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\Dummy'));
+        $this->assertTrue($factory->hasMetadataFor(Dummy::class));
     }
 
     /**
@@ -57,7 +59,7 @@ public function testHasMetadataFor()
      */
     public function testInvalidClassThrowsException()
     {
-        $decorated = $this->getMock('Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface');
+        $decorated = $this->getMock(ClassMetadataFactoryInterface::class);
         $factory = new CacheClassMetadataFactory($decorated, new ArrayAdapter());
 
         $factory->getMetadataFor('Not\Exist');