diff --git a/.github/patch-types.php b/.github/patch-types.php
index 3c91c7f580..ec4f35655a 100644
--- a/.github/patch-types.php
+++ b/.github/patch-types.php
@@ -35,6 +35,7 @@ foreach ($loader->getClassMap() as $class => $file) {
         case false !== strpos($file, '/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Php80Dummy.php'):
         case false !== strpos($file, '/src/Symfony/Component/Routing/Tests/Fixtures/AttributeFixtures'):
         case false !== strpos($file, '/src/Symfony/Component/Serializer/Tests/Normalizer/Features/ObjectOuter.php'):
+        case false !== strpos($file, '/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/'):
         case false !== strpos($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/LotsOfAttributes.php'):
         case false !== strpos($file, '/src/Symfony/Component/Validator/Tests/Fixtures/Attribute/'):
         case false !== strpos($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/MyAttribute.php'):
diff --git a/src/Symfony/Component/Serializer/Annotation/DiscriminatorMap.php b/src/Symfony/Component/Serializer/Annotation/DiscriminatorMap.php
index c1184a53a5..18df1c38d6 100644
--- a/src/Symfony/Component/Serializer/Annotation/DiscriminatorMap.php
+++ b/src/Symfony/Component/Serializer/Annotation/DiscriminatorMap.php
@@ -21,6 +21,7 @@ use Symfony\Component\Serializer\Exception\InvalidArgumentException;
  *
  * @author Samuel Roze <samuel.roze@gmail.com>
  */
+#[\Attribute(\Attribute::TARGET_CLASS)]
 class DiscriminatorMap
 {
     /**
@@ -34,20 +35,29 @@ class DiscriminatorMap
     private $mapping;
 
     /**
+     * @param string|array $typeProperty
+     *
      * @throws InvalidArgumentException
      */
-    public function __construct(array $data)
+    public function __construct($typeProperty, array $mapping = null)
     {
-        if (empty($data['typeProperty'])) {
+        if (\is_array($typeProperty)) {
+            $mapping = $typeProperty['mapping'] ?? null;
+            $typeProperty = $typeProperty['typeProperty'] ?? null;
+        } elseif (!\is_string($typeProperty)) {
+            throw new \TypeError(sprintf('"%s": Argument $typeProperty was expected to be a string or array, got "%s".', __METHOD__, get_debug_type($typeProperty)));
+        }
+
+        if (empty($typeProperty)) {
             throw new InvalidArgumentException(sprintf('Parameter "typeProperty" of annotation "%s" cannot be empty.', static::class));
         }
 
-        if (empty($data['mapping'])) {
+        if (empty($mapping)) {
             throw new InvalidArgumentException(sprintf('Parameter "mapping" of annotation "%s" cannot be empty.', static::class));
         }
 
-        $this->typeProperty = $data['typeProperty'];
-        $this->mapping = $data['mapping'];
+        $this->typeProperty = $typeProperty;
+        $this->mapping = $mapping;
     }
 
     public function getTypeProperty(): string
diff --git a/src/Symfony/Component/Serializer/Annotation/Groups.php b/src/Symfony/Component/Serializer/Annotation/Groups.php
index 4358a3e26d..8f1e1d94f9 100644
--- a/src/Symfony/Component/Serializer/Annotation/Groups.php
+++ b/src/Symfony/Component/Serializer/Annotation/Groups.php
@@ -21,6 +21,7 @@ use Symfony\Component\Serializer\Exception\InvalidArgumentException;
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_PROPERTY)]
 class Groups
 {
     /**
@@ -31,20 +32,22 @@ class Groups
     /**
      * @throws InvalidArgumentException
      */
-    public function __construct(array $data)
+    public function __construct(array $groups)
     {
-        if (!isset($data['value']) || !$data['value']) {
+        if (isset($groups['value'])) {
+            $groups = (array) $groups['value'];
+        }
+        if (empty($groups)) {
             throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" cannot be empty.', static::class));
         }
 
-        $value = (array) $data['value'];
-        foreach ($value as $group) {
+        foreach ($groups as $group) {
             if (!\is_string($group)) {
                 throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" must be a string or an array of strings.', static::class));
             }
         }
 
-        $this->groups = $value;
+        $this->groups = $groups;
     }
 
     /**
diff --git a/src/Symfony/Component/Serializer/Annotation/Ignore.php b/src/Symfony/Component/Serializer/Annotation/Ignore.php
index 313c7f7947..b09e7007a4 100644
--- a/src/Symfony/Component/Serializer/Annotation/Ignore.php
+++ b/src/Symfony/Component/Serializer/Annotation/Ignore.php
@@ -19,6 +19,7 @@ namespace Symfony\Component\Serializer\Annotation;
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_PROPERTY)]
 final class Ignore
 {
 }
diff --git a/src/Symfony/Component/Serializer/Annotation/MaxDepth.php b/src/Symfony/Component/Serializer/Annotation/MaxDepth.php
index 9939fdab1c..97d29869a0 100644
--- a/src/Symfony/Component/Serializer/Annotation/MaxDepth.php
+++ b/src/Symfony/Component/Serializer/Annotation/MaxDepth.php
@@ -21,6 +21,7 @@ use Symfony\Component\Serializer\Exception\InvalidArgumentException;
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_PROPERTY)]
 class MaxDepth
 {
     /**
@@ -28,17 +29,23 @@ class MaxDepth
      */
     private $maxDepth;
 
-    public function __construct(array $data)
+    /**
+     * @param int|array $maxDepth
+     */
+    public function __construct($maxDepth)
     {
-        if (!isset($data['value'])) {
-            throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" should be set.', static::class));
+        if (\is_array($maxDepth)) {
+            if (!isset($maxDepth['value'])) {
+                throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" should be set.', static::class));
+            }
+            $maxDepth = $maxDepth['value'];
         }
 
-        if (!\is_int($data['value']) || $data['value'] <= 0) {
+        if (!\is_int($maxDepth) || $maxDepth <= 0) {
             throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" must be a positive integer.', static::class));
         }
 
-        $this->maxDepth = $data['value'];
+        $this->maxDepth = $maxDepth;
     }
 
     public function getMaxDepth()
diff --git a/src/Symfony/Component/Serializer/Annotation/SerializedName.php b/src/Symfony/Component/Serializer/Annotation/SerializedName.php
index 747c8c55f1..d621d9903d 100644
--- a/src/Symfony/Component/Serializer/Annotation/SerializedName.php
+++ b/src/Symfony/Component/Serializer/Annotation/SerializedName.php
@@ -21,6 +21,7 @@ use Symfony\Component\Serializer\Exception\InvalidArgumentException;
  *
  * @author Fabien Bourigault <bourigaultfabien@gmail.com>
  */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_PROPERTY)]
 final class SerializedName
 {
     /**
@@ -28,17 +29,23 @@ final class SerializedName
      */
     private $serializedName;
 
-    public function __construct(array $data)
+    /**
+     * @param string|array $serializedName
+     */
+    public function __construct($serializedName)
     {
-        if (!isset($data['value'])) {
-            throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" should be set.', static::class));
+        if (\is_array($serializedName)) {
+            if (!isset($serializedName['value'])) {
+                throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" should be set.', static::class));
+            }
+            $serializedName = $serializedName['value'];
         }
 
-        if (!\is_string($data['value']) || empty($data['value'])) {
+        if (!\is_string($serializedName) || empty($serializedName)) {
             throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" must be a non-empty string.', static::class));
         }
 
-        $this->serializedName = $data['value'];
+        $this->serializedName = $serializedName;
     }
 
     public function getSerializedName(): string
diff --git a/src/Symfony/Component/Serializer/CHANGELOG.md b/src/Symfony/Component/Serializer/CHANGELOG.md
index 0fc8fd2c68..97ae3fd62f 100644
--- a/src/Symfony/Component/Serializer/CHANGELOG.md
+++ b/src/Symfony/Component/Serializer/CHANGELOG.md
@@ -8,6 +8,7 @@ CHANGELOG
  * added `UidNormalizer`
  * added `FormErrorNormalizer`
  * added `MimeMessageNormalizer`
+ * serializer mapping can be configured using php attributes
 
 5.1.0
 -----
diff --git a/src/Symfony/Component/Serializer/Mapping/Loader/AnnotationLoader.php b/src/Symfony/Component/Serializer/Mapping/Loader/AnnotationLoader.php
index 978fe659bb..9409bca360 100644
--- a/src/Symfony/Component/Serializer/Mapping/Loader/AnnotationLoader.php
+++ b/src/Symfony/Component/Serializer/Mapping/Loader/AnnotationLoader.php
@@ -26,12 +26,21 @@ use Symfony\Component\Serializer\Mapping\ClassMetadataInterface;
  * Annotation loader.
  *
  * @author Kévin Dunglas <dunglas@gmail.com>
+ * @author Alexander M. Turek <me@derrabus.de>
  */
 class AnnotationLoader implements LoaderInterface
 {
+    private const KNOWN_ANNOTATIONS = [
+        DiscriminatorMap::class => true,
+        Groups::class => true,
+        Ignore:: class => true,
+        MaxDepth::class => true,
+        SerializedName::class => true,
+    ];
+
     private $reader;
 
-    public function __construct(Reader $reader)
+    public function __construct(Reader $reader = null)
     {
         $this->reader = $reader;
     }
@@ -47,7 +56,7 @@ class AnnotationLoader implements LoaderInterface
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
 
-        foreach ($this->reader->getClassAnnotations($reflectionClass) as $annotation) {
+        foreach ($this->loadAnnotations($reflectionClass) as $annotation) {
             if ($annotation instanceof DiscriminatorMap) {
                 $classMetadata->setClassDiscriminatorMapping(new ClassDiscriminatorMapping(
                     $annotation->getTypeProperty(),
@@ -63,7 +72,7 @@ class AnnotationLoader implements LoaderInterface
             }
 
             if ($property->getDeclaringClass()->name === $className) {
-                foreach ($this->reader->getPropertyAnnotations($property) as $annotation) {
+                foreach ($this->loadAnnotations($property) as $annotation) {
                     if ($annotation instanceof Groups) {
                         foreach ($annotation->getGroups() as $group) {
                             $attributesMetadata[$property->name]->addGroup($group);
@@ -98,7 +107,7 @@ class AnnotationLoader implements LoaderInterface
                 }
             }
 
-            foreach ($this->reader->getMethodAnnotations($method) as $annotation) {
+            foreach ($this->loadAnnotations($method) as $annotation) {
                 if ($annotation instanceof Groups) {
                     if (!$accessorOrMutator) {
                         throw new MappingException(sprintf('Groups on "%s::%s" cannot be added. Groups can only be added on methods beginning with "get", "is", "has" or "set".', $className, $method->name));
@@ -129,4 +138,32 @@ class AnnotationLoader implements LoaderInterface
 
         return $loaded;
     }
+
+    /**
+     * @param \ReflectionClass|\ReflectionMethod|\ReflectionProperty $reflector
+     */
+    public function loadAnnotations(object $reflector): iterable
+    {
+        if (\PHP_VERSION_ID >= 80000) {
+            foreach ($reflector->getAttributes() as $attribute) {
+                if (self::KNOWN_ANNOTATIONS[$attribute->getName()] ?? false) {
+                    yield $attribute->newInstance();
+                }
+            }
+        }
+
+        if (null === $this->reader) {
+            return;
+        }
+
+        if ($reflector instanceof \ReflectionClass) {
+            yield from $this->reader->getClassAnnotations($reflector);
+        }
+        if ($reflector instanceof \ReflectionMethod) {
+            yield from $this->reader->getMethodAnnotations($reflector);
+        }
+        if ($reflector instanceof \ReflectionProperty) {
+            yield from $this->reader->getPropertyAnnotations($reflector);
+        }
+    }
 }
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummy.php
similarity index 58%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummy.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummy.php
index 4ae9812e7c..fad842b0d4 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummy.php
@@ -9,15 +9,15 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
 
 use Symfony\Component\Serializer\Annotation\DiscriminatorMap;
 
 /**
  * @DiscriminatorMap(typeProperty="type", mapping={
- *    "first"="Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild",
- *    "second"="Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild",
- *    "third"="Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyThirdChild",
+ *    "first"="Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild",
+ *    "second"="Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild",
+ *    "third"="Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyThirdChild",
  * })
  */
 abstract class AbstractDummy
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummyFirstChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummyFirstChild.php
new file mode 100644
index 0000000000..81f15aaf0d
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummyFirstChild.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
+
+use Symfony\Component\Serializer\Tests\Fixtures\DummyFirstChildQuux;
+
+class AbstractDummyFirstChild extends AbstractDummy
+{
+    public $bar;
+
+    /** @var DummyFirstChildQuux|null */
+    public $quux;
+
+    public function __construct($foo = null, $bar = null)
+    {
+        parent::__construct($foo);
+
+        $this->bar = $bar;
+    }
+
+    public function getQuux(): ?DummyFirstChildQuux
+    {
+        return $this->quux;
+    }
+
+    public function setQuux(DummyFirstChildQuux $quux): void
+    {
+        $this->quux = $quux;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummySecondChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummySecondChild.php
new file mode 100644
index 0000000000..4d113066bb
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummySecondChild.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
+
+use Symfony\Component\Serializer\Tests\Fixtures\DummySecondChildQuux;
+
+class AbstractDummySecondChild extends AbstractDummy
+{
+    public $baz;
+
+    /** @var DummySecondChildQuux|null */
+    public $quux;
+
+    public function __construct($foo = null, $baz = null)
+    {
+        parent::__construct($foo);
+
+        $this->baz = $baz;
+    }
+
+    public function getQuux(): ?DummySecondChildQuux
+    {
+        return $this->quux;
+    }
+
+    public function setQuux(DummySecondChildQuux $quux): void
+    {
+        $this->quux = $quux;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummyThirdChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummyThirdChild.php
new file mode 100644
index 0000000000..2df26c3320
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/AbstractDummyThirdChild.php
@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
+
+final class AbstractDummyThirdChild extends AbstractDummyFirstChild
+{
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummy.php
similarity index 90%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummy.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummy.php
index 37bfa7eb3f..cf26b6e0da 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummy.php
@@ -9,9 +9,10 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
 
 use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Serializer\Tests\Fixtures\GroupDummyInterface;
 
 /**
  * @author Kévin Dunglas <dunglas@gmail.com>
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummyChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummyChild.php
new file mode 100644
index 0000000000..c8845736ac
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummyChild.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
+
+class GroupDummyChild extends GroupDummy
+{
+    private $baz;
+
+    /**
+     * @return mixed
+     */
+    public function getBaz()
+    {
+        return $this->baz;
+    }
+
+    /**
+     * @param mixed $baz
+     */
+    public function setBaz($baz)
+    {
+        $this->baz = $baz;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummyParent.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummyParent.php
similarity index 92%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummyParent.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummyParent.php
index dd24233993..77d539b940 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummyParent.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/GroupDummyParent.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
 
 use Symfony\Component\Serializer\Annotation\Groups;
 
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/IgnoreDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/IgnoreDummy.php
similarity index 89%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/IgnoreDummy.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/IgnoreDummy.php
index a272b4c6fe..900447c581 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/IgnoreDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/IgnoreDummy.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
 
 use Symfony\Component\Serializer\Annotation\Ignore;
 
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/MaxDepthDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/MaxDepthDummy.php
similarity index 91%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/MaxDepthDummy.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/MaxDepthDummy.php
index 92a4045f1e..12be2db03b 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/MaxDepthDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/MaxDepthDummy.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
 
 use Symfony\Component\Serializer\Annotation\MaxDepth;
 
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/SerializedNameDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/SerializedNameDummy.php
similarity index 91%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/SerializedNameDummy.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/SerializedNameDummy.php
index 6fed9d201a..1eaa579b46 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/SerializedNameDummy.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/SerializedNameDummy.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
 
 use Symfony\Component\Serializer\Annotation\SerializedName;
 
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummy.php
new file mode 100644
index 0000000000..2e66f465b3
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummy.php
@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\DiscriminatorMap;
+
+#[DiscriminatorMap(typeProperty: 'type', mapping: [
+    'first' => AbstractDummyFirstChild::class,
+    'second' => AbstractDummySecondChild::class,
+    'third' => AbstractDummyThirdChild::class,
+])]
+abstract class AbstractDummy
+{
+    public $foo;
+
+    public function __construct($foo = null)
+    {
+        $this->foo = $foo;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummyFirstChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummyFirstChild.php
similarity index 83%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummyFirstChild.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummyFirstChild.php
index 20672c39b5..b5cd2faba2 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummyFirstChild.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummyFirstChild.php
@@ -9,7 +9,9 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Tests\Fixtures\DummyFirstChildQuux;
 
 class AbstractDummyFirstChild extends AbstractDummy
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummySecondChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummySecondChild.php
similarity index 83%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummySecondChild.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummySecondChild.php
index 67a72977e2..e245033cc2 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummySecondChild.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummySecondChild.php
@@ -9,7 +9,9 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Tests\Fixtures\DummySecondChildQuux;
 
 class AbstractDummySecondChild extends AbstractDummy
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummyThirdChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummyThirdChild.php
similarity index 82%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummyThirdChild.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummyThirdChild.php
index 3701e8c3f3..d5ef40c644 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/AbstractDummyThirdChild.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/AbstractDummyThirdChild.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
 
 final class AbstractDummyThirdChild extends AbstractDummyFirstChild
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummy.php
new file mode 100644
index 0000000000..eef1c55be9
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummy.php
@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Serializer\Tests\Fixtures\GroupDummyInterface;
+
+/**
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class GroupDummy extends GroupDummyParent implements GroupDummyInterface
+{
+    #[Groups(["a"])]
+    private $foo;
+    #[Groups(["b", "c", "name_converter"])]
+    protected $bar;
+    private $fooBar;
+    private $symfony;
+
+    #[Groups(["b"])]
+    public function setBar($bar)
+    {
+        $this->bar = $bar;
+    }
+
+    #[Groups(["c"])]
+    public function getBar()
+    {
+        return $this->bar;
+    }
+
+    public function setFoo($foo)
+    {
+        $this->foo = $foo;
+    }
+
+    public function getFoo()
+    {
+        return $this->foo;
+    }
+
+    public function setFooBar($fooBar)
+    {
+        $this->fooBar = $fooBar;
+    }
+
+    #[Groups(["a", "b", "name_converter"])]
+    public function isFooBar()
+    {
+        return $this->fooBar;
+    }
+
+    public function setSymfony($symfony)
+    {
+        $this->symfony = $symfony;
+    }
+
+    public function getSymfony()
+    {
+        return $this->symfony;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummyChild.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummyChild.php
similarity index 88%
rename from src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummyChild.php
rename to src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummyChild.php
index fa72160ec6..5a7423914c 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/GroupDummyChild.php
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummyChild.php
@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Serializer\Tests\Fixtures;
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
 
 class GroupDummyChild extends GroupDummy
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummyParent.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummyParent.php
new file mode 100644
index 0000000000..51a89acc47
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/GroupDummyParent.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\Groups;
+
+/**
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class GroupDummyParent
+{
+    #[Groups(["a"])]
+    private $kevin;
+    private $coopTilleuls;
+
+    public function setKevin($kevin)
+    {
+        $this->kevin = $kevin;
+    }
+
+    public function getKevin()
+    {
+        return $this->kevin;
+    }
+
+    public function setCoopTilleuls($coopTilleuls)
+    {
+        $this->coopTilleuls = $coopTilleuls;
+    }
+
+    #[Groups(["a", "b"])]
+    public function getCoopTilleuls()
+    {
+        return $this->coopTilleuls;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/IgnoreDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/IgnoreDummy.php
new file mode 100644
index 0000000000..85d7a9ca41
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/IgnoreDummy.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\Ignore;
+
+/**
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class IgnoreDummy
+{
+    public $notIgnored;
+    #[Ignore]
+    public $ignored1;
+    private $ignored2;
+
+    #[Ignore]
+    public function getIgnored2()
+    {
+        return $this->ignored2;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/MaxDepthDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/MaxDepthDummy.php
new file mode 100644
index 0000000000..7a1dc42c2f
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/MaxDepthDummy.php
@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\MaxDepth;
+
+/**
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class MaxDepthDummy
+{
+    #[MaxDepth(2)]
+    public $foo;
+
+    public $bar;
+
+    /**
+     * @var self
+     */
+    public $child;
+
+    #[MaxDepth(3)]
+    public function getBar()
+    {
+        return $this->bar;
+    }
+
+    public function getChild()
+    {
+        return $this->child;
+    }
+
+    public function getFoo()
+    {
+        return $this->foo;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/SerializedNameDummy.php b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/SerializedNameDummy.php
new file mode 100644
index 0000000000..39ded47731
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/SerializedNameDummy.php
@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\SerializedName;
+
+/**
+ * @author Fabien Bourigault <bourigaultfabien@gmail.com>
+ */
+class SerializedNameDummy
+{
+    #[SerializedName("baz")]
+    public $foo;
+
+    public $bar;
+
+    public $quux;
+
+    /**
+     * @var self
+     */
+    public $child;
+
+    #[SerializedName("qux")]
+    public function getBar()
+    {
+        return $this->bar;
+    }
+
+    public function getChild()
+    {
+        return $this->child;
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/invalid-ignore.yml b/src/Symfony/Component/Serializer/Tests/Fixtures/invalid-ignore.yml
index d245021d8c..00aa0fa962 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/invalid-ignore.yml
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/invalid-ignore.yml
@@ -1,4 +1,4 @@
-'Symfony\Component\Serializer\Tests\Fixtures\IgnoreDummy':
+'Symfony\Component\Serializer\Tests\Fixtures\Annotations\IgnoreDummy':
   attributes:
     ignored1:
       ignore: foo
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml b/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml
index 257d838b49..635253dd8e 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.xml
@@ -4,7 +4,7 @@
                     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                     xsi:schemaLocation="http://symfony.com/schema/dic/serializer-mapping https://symfony.com/schema/dic/serializer-mapping/serializer-mapping-1.0.xsd">
 
-    <class name="Symfony\Component\Serializer\Tests\Fixtures\GroupDummy">
+    <class name="Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy">
         <attribute name="foo">
             <group>group1</group>
             <group>group2</group>
@@ -15,26 +15,26 @@
         </attribute>
     </class>
 
-    <class name="Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy">
+    <class name="Symfony\Component\Serializer\Tests\Fixtures\Annotations\MaxDepthDummy">
         <attribute name="foo" max-depth="2" />
         <attribute name="bar" max-depth="3" />
     </class>
 
-    <class name="Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy">
+    <class name="Symfony\Component\Serializer\Tests\Fixtures\Annotations\SerializedNameDummy">
         <attribute name="foo" serialized-name="baz" />
         <attribute name="bar" serialized-name="qux" />
     </class>
 
-    <class name="Symfony\Component\Serializer\Tests\Fixtures\AbstractDummy">
+    <class name="Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummy">
         <discriminator-map type-property="type">
-            <mapping type="first" class="Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild" />
-            <mapping type="second" class="Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild" />
+            <mapping type="first" class="Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild" />
+            <mapping type="second" class="Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild" />
         </discriminator-map>
 
         <attribute name="foo" />
     </class>
 
-    <class name="Symfony\Component\Serializer\Tests\Fixtures\IgnoreDummy">
+    <class name="Symfony\Component\Serializer\Tests\Fixtures\Annotations\IgnoreDummy">
         <attribute name="ignored1" ignore="true" />
         <attribute name="ignored2" ignore="true" />
     </class>
diff --git a/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.yml b/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.yml
index 4d98c73b04..5b212c8914 100644
--- a/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.yml
+++ b/src/Symfony/Component/Serializer/Tests/Fixtures/serialization.yml
@@ -1,30 +1,30 @@
-'Symfony\Component\Serializer\Tests\Fixtures\GroupDummy':
+'Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy':
   attributes:
     foo:
       groups: ['group1', 'group2']
     bar:
       groups: ['group2']
-'Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy':
+'Symfony\Component\Serializer\Tests\Fixtures\Annotations\MaxDepthDummy':
   attributes:
     foo:
       max_depth: 2
     bar:
       max_depth: 3
-'Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy':
+'Symfony\Component\Serializer\Tests\Fixtures\Annotations\SerializedNameDummy':
   attributes:
     foo:
       serialized_name: 'baz'
     bar:
       serialized_name: 'qux'
-'Symfony\Component\Serializer\Tests\Fixtures\AbstractDummy':
+'Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummy':
   discriminator_map:
     type_property: type
     mapping:
-      first: 'Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild'
-      second: 'Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild'
+      first: 'Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild'
+      second: 'Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild'
   attributes:
     foo: ~
-'Symfony\Component\Serializer\Tests\Fixtures\IgnoreDummy':
+'Symfony\Component\Serializer\Tests\Fixtures\Annotations\IgnoreDummy':
   attributes:
     ignored1:
       ignore: true
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/ClassDiscriminatorMappingTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/ClassDiscriminatorMappingTest.php
index aed2d221d4..9c94a0463d 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/ClassDiscriminatorMappingTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/ClassDiscriminatorMappingTest.php
@@ -13,9 +13,9 @@ namespace Symfony\Component\Serializer\Tests\Mapping;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorMapping;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyThirdChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyThirdChild;
 
 /**
  * @author Samuel Roze <samuel.roze@gmail.com>
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryCompilerTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryCompilerTest.php
index 87feb8f99c..2ce24718df 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryCompilerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryCompilerTest.php
@@ -8,8 +8,8 @@ use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryCompiler;
 use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
 use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
-use Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\MaxDepthDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\SerializedNameDummy;
 
 final class ClassMetadataFactoryCompilerTest extends TestCase
 {
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryTest.php
index db0e887fb5..3034eb4c4a 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/ClassMetadataFactoryTest.php
@@ -32,16 +32,16 @@ class ClassMetadataFactoryTest extends TestCase
     public function testGetMetadataFor()
     {
         $factory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
-        $classMetadata = $factory->getMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
+        $classMetadata = $factory->getMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy');
 
-        $this->assertEquals(TestClassMetadataFactory::createClassMetadata(true, true), $classMetadata);
+        $this->assertEquals(TestClassMetadataFactory::createClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations', true, true), $classMetadata);
     }
 
     public function testHasMetadataFor()
     {
         $factory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
-        $this->assertTrue($factory->hasMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy'));
-        $this->assertTrue($factory->hasMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\GroupDummyParent'));
+        $this->assertTrue($factory->hasMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy'));
+        $this->assertTrue($factory->hasMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummyParent'));
         $this->assertTrue($factory->hasMetadataFor('Symfony\Component\Serializer\Tests\Fixtures\GroupDummyInterface'));
         $this->assertFalse($factory->hasMetadataFor('Dunglas\Entity'));
     }
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CompiledClassMetadataFactoryTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CompiledClassMetadataFactoryTest.php
index 21beddd3f6..034e8aa088 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CompiledClassMetadataFactoryTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Factory/CompiledClassMetadataFactoryTest.php
@@ -8,7 +8,7 @@ use Symfony\Component\Serializer\Mapping\ClassMetadata;
 use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
 use Symfony\Component\Serializer\Mapping\Factory\CompiledClassMetadataFactory;
 use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
-use Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\SerializedNameDummy;
 
 /**
  * @author Fabien Bourigault <bourigaultfabien@gmail.com>
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderTest.php
index 9c5a9943e3..690f1c4b81 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderTest.php
@@ -11,23 +11,17 @@
 
 namespace Symfony\Component\Serializer\Tests\Mapping\Loader;
 
-use Doctrine\Common\Annotations\AnnotationReader;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Serializer\Mapping\AttributeMetadata;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorMapping;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
 use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild;
-use Symfony\Component\Serializer\Tests\Fixtures\IgnoreDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyThirdChild;
 use Symfony\Component\Serializer\Tests\Mapping\TestClassMetadataFactory;
 
 /**
  * @author Kévin Dunglas <dunglas@gmail.com>
  */
-class AnnotationLoaderTest extends TestCase
+abstract class AnnotationLoaderTest extends TestCase
 {
     /**
      * @var AnnotationLoader
@@ -36,7 +30,7 @@ class AnnotationLoaderTest extends TestCase
 
     protected function setUp(): void
     {
-        $this->loader = new AnnotationLoader(new AnnotationReader());
+        $this->loader = $this->createLoader();
     }
 
     public function testInterface()
@@ -46,28 +40,28 @@ class AnnotationLoaderTest extends TestCase
 
     public function testLoadClassMetadataReturnsTrueIfSuccessful()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
+        $classMetadata = new ClassMetadata($this->getNamespace().'\GroupDummy');
 
         $this->assertTrue($this->loader->loadClassMetadata($classMetadata));
     }
 
     public function testLoadGroups()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
+        $classMetadata = new ClassMetadata($this->getNamespace().'\GroupDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
-        $this->assertEquals(TestClassMetadataFactory::createClassMetadata(), $classMetadata);
+        $this->assertEquals(TestClassMetadataFactory::createClassMetadata($this->getNamespace()), $classMetadata);
     }
 
     public function testLoadDiscriminatorMap()
     {
-        $classMetadata = new ClassMetadata(AbstractDummy::class);
+        $classMetadata = new ClassMetadata($this->getNamespace().'\AbstractDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
-        $expected = new ClassMetadata(AbstractDummy::class, new ClassDiscriminatorMapping('type', [
-            'first' => AbstractDummyFirstChild::class,
-            'second' => AbstractDummySecondChild::class,
-            'third' => AbstractDummyThirdChild::class,
+        $expected = new ClassMetadata($this->getNamespace().'\AbstractDummy', new ClassDiscriminatorMapping('type', [
+            'first' => $this->getNamespace().'\AbstractDummyFirstChild',
+            'second' => $this->getNamespace().'\AbstractDummySecondChild',
+            'third' => $this->getNamespace().'\AbstractDummyThirdChild',
         ]));
 
         $expected->addAttributeMetadata(new AttributeMetadata('foo'));
@@ -78,7 +72,7 @@ class AnnotationLoaderTest extends TestCase
 
     public function testLoadMaxDepth()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy');
+        $classMetadata = new ClassMetadata($this->getNamespace().'\MaxDepthDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
@@ -88,7 +82,7 @@ class AnnotationLoaderTest extends TestCase
 
     public function testLoadSerializedName()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy');
+        $classMetadata = new ClassMetadata($this->getNamespace().'\SerializedNameDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
@@ -98,24 +92,27 @@ class AnnotationLoaderTest extends TestCase
 
     public function testLoadClassMetadataAndMerge()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
-        $parentClassMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummyParent');
+        $classMetadata = new ClassMetadata($this->getNamespace().'\GroupDummy');
+        $parentClassMetadata = new ClassMetadata($this->getNamespace().'\GroupDummyParent');
 
         $this->loader->loadClassMetadata($parentClassMetadata);
         $classMetadata->merge($parentClassMetadata);
 
         $this->loader->loadClassMetadata($classMetadata);
 
-        $this->assertEquals(TestClassMetadataFactory::createClassMetadata(true), $classMetadata);
+        $this->assertEquals(TestClassMetadataFactory::createClassMetadata($this->getNamespace(), true), $classMetadata);
     }
 
     public function testLoadIgnore()
     {
-        $classMetadata = new ClassMetadata(IgnoreDummy::class);
+        $classMetadata = new ClassMetadata($this->getNamespace().'\IgnoreDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
         $this->assertTrue($attributesMetadata['ignored1']->isIgnored());
         $this->assertTrue($attributesMetadata['ignored2']->isIgnored());
     }
+
+    abstract protected function createLoader(): AnnotationLoader;
+    abstract protected function getNamespace(): string;
 }
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderWithAttributesTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderWithAttributesTest.php
new file mode 100644
index 0000000000..c5836f26f9
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderWithAttributesTest.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Mapping\Loader;
+
+use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
+
+/**
+ * @requires PHP 8
+ */
+class AnnotationLoaderWithAttributesTest extends AnnotationLoaderTest
+{
+    protected function createLoader(): AnnotationLoader
+    {
+        return new AnnotationLoader();
+    }
+
+    protected function getNamespace(): string
+    {
+        return 'Symfony\Component\Serializer\Tests\Fixtures\Attributes';
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderWithDoctrineAnnotationsTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderWithDoctrineAnnotationsTest.php
new file mode 100644
index 0000000000..37675a49d9
--- /dev/null
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderWithDoctrineAnnotationsTest.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Tests\Mapping\Loader;
+
+use Doctrine\Common\Annotations\AnnotationReader;
+use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
+
+class AnnotationLoaderWithDoctrineAnnotationsTest extends AnnotationLoaderTest
+{
+    protected function createLoader(): AnnotationLoader
+    {
+        return new AnnotationLoader(new AnnotationReader());
+    }
+
+    protected function getNamespace(): string
+    {
+        return 'Symfony\Component\Serializer\Tests\Fixtures\Annotations';
+    }
+}
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
index 4d30c8e2cb..8a5e0e13f7 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/XmlFileLoaderTest.php
@@ -16,10 +16,10 @@ use Symfony\Component\Serializer\Mapping\AttributeMetadata;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorMapping;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
 use Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild;
-use Symfony\Component\Serializer\Tests\Fixtures\IgnoreDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\IgnoreDummy;
 use Symfony\Component\Serializer\Tests\Mapping\TestClassMetadataFactory;
 
 /**
@@ -39,7 +39,7 @@ class XmlFileLoaderTest extends TestCase
     protected function setUp(): void
     {
         $this->loader = new XmlFileLoader(__DIR__.'/../../Fixtures/serialization.xml');
-        $this->metadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
+        $this->metadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy');
     }
 
     public function testInterface()
@@ -61,7 +61,7 @@ class XmlFileLoaderTest extends TestCase
 
     public function testMaxDepth()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy');
+        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations\MaxDepthDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
@@ -71,7 +71,7 @@ class XmlFileLoaderTest extends TestCase
 
     public function testSerializedName()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy');
+        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations\SerializedNameDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php
index 6d2ff5c0bd..2e708665f5 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/Loader/YamlFileLoaderTest.php
@@ -17,10 +17,10 @@ use Symfony\Component\Serializer\Mapping\AttributeMetadata;
 use Symfony\Component\Serializer\Mapping\ClassDiscriminatorMapping;
 use Symfony\Component\Serializer\Mapping\ClassMetadata;
 use Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild;
-use Symfony\Component\Serializer\Tests\Fixtures\IgnoreDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\IgnoreDummy;
 use Symfony\Component\Serializer\Tests\Mapping\TestClassMetadataFactory;
 
 /**
@@ -40,7 +40,7 @@ class YamlFileLoaderTest extends TestCase
     protected function setUp(): void
     {
         $this->loader = new YamlFileLoader(__DIR__.'/../../Fixtures/serialization.yml');
-        $this->metadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
+        $this->metadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy');
     }
 
     public function testInterface()
@@ -75,7 +75,7 @@ class YamlFileLoaderTest extends TestCase
 
     public function testMaxDepth()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy');
+        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations\MaxDepthDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
@@ -85,7 +85,7 @@ class YamlFileLoaderTest extends TestCase
 
     public function testSerializedName()
     {
-        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy');
+        $classMetadata = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations\SerializedNameDummy');
         $this->loader->loadClassMetadata($classMetadata);
 
         $attributesMetadata = $classMetadata->getAttributesMetadata();
diff --git a/src/Symfony/Component/Serializer/Tests/Mapping/TestClassMetadataFactory.php b/src/Symfony/Component/Serializer/Tests/Mapping/TestClassMetadataFactory.php
index 71fa42be8a..4fcb8e5436 100644
--- a/src/Symfony/Component/Serializer/Tests/Mapping/TestClassMetadataFactory.php
+++ b/src/Symfony/Component/Serializer/Tests/Mapping/TestClassMetadataFactory.php
@@ -19,9 +19,9 @@ use Symfony\Component\Serializer\Mapping\ClassMetadata;
  */
 class TestClassMetadataFactory
 {
-    public static function createClassMetadata(bool $withParent = false, bool $withInterface = false)
+    public static function createClassMetadata(string $namespace, bool $withParent = false, bool $withInterface = false): ClassMetadata
     {
-        $expected = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
+        $expected = new ClassMetadata($namespace.'\GroupDummy');
 
         $foo = new AttributeMetadata('foo');
         $foo->addGroup('a');
@@ -64,9 +64,9 @@ class TestClassMetadataFactory
         return $expected;
     }
 
-    public static function createXmlCLassMetadata()
+    public static function createXmlCLassMetadata(): ClassMetadata
     {
-        $expected = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\GroupDummy');
+        $expected = new ClassMetadata('Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy');
 
         $foo = new AttributeMetadata('foo');
         $foo->addGroup('group1');
diff --git a/src/Symfony/Component/Serializer/Tests/NameConverter/MetadataAwareNameConverterTest.php b/src/Symfony/Component/Serializer/Tests/NameConverter/MetadataAwareNameConverterTest.php
index 9b0ad4d79c..ba20bc7b0d 100644
--- a/src/Symfony/Component/Serializer/Tests/NameConverter/MetadataAwareNameConverterTest.php
+++ b/src/Symfony/Component/Serializer/Tests/NameConverter/MetadataAwareNameConverterTest.php
@@ -19,7 +19,7 @@ use Symfony\Component\Serializer\Mapping\Loader\AnnotationLoader;
 use Symfony\Component\Serializer\NameConverter\MetadataAwareNameConverter;
 use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\OtherSerializedNameDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\SerializedNameDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\SerializedNameDummy;
 
 /**
  * @author Fabien Bourigault <bourigaultfabien@gmail.com>
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractNormalizerTest.php
index 082b427ab7..3aa4d1c63d 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractNormalizerTest.php
@@ -15,7 +15,7 @@ use Symfony\Component\Serializer\Normalizer\PropertyNormalizer;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\Tests\Fixtures\AbstractNormalizerDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
-use Symfony\Component\Serializer\Tests\Fixtures\IgnoreDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\IgnoreDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\NullableConstructorArgumentDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\StaticConstructorDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\StaticConstructorNormalizer;
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
index 71d999a466..55fced0ab3 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
@@ -31,9 +31,9 @@ use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\SerializerAwareInterface;
 use Symfony\Component\Serializer\SerializerInterface;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild;
 use Symfony\Component\Serializer\Tests\Fixtures\DummySecondChildQuux;
 
 class AbstractObjectNormalizerTest extends TestCase
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/Features/GroupsTestTrait.php b/src/Symfony/Component/Serializer/Tests/Normalizer/Features/GroupsTestTrait.php
index 1d9777d7a0..619cb4e885 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/Features/GroupsTestTrait.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/Features/GroupsTestTrait.php
@@ -4,7 +4,7 @@ namespace Symfony\Component\Serializer\Tests\Normalizer\Features;
 
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
-use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy;
 
 /**
  * Test AbstractNormalizer::GROUPS.
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/Features/MaxDepthTestTrait.php b/src/Symfony/Component/Serializer/Tests/Normalizer/Features/MaxDepthTestTrait.php
index 229a1f822a..0b7f115ace 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/Features/MaxDepthTestTrait.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/Features/MaxDepthTestTrait.php
@@ -3,7 +3,7 @@
 namespace Symfony\Component\Serializer\Tests\Normalizer\Features;
 
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
-use Symfony\Component\Serializer\Tests\Fixtures\MaxDepthDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\MaxDepthDummy;
 
 /**
  * Covers AbstractObjectNormalizer::ENABLE_MAX_DEPTH and AbstractObjectNormalizer::MAX_DEPTH_HANDLER.
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php
index d6beb7c19e..b2efafc348 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php
@@ -28,7 +28,7 @@ use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\SerializerInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\CircularReferenceDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\SiblingHolder;
 use Symfony\Component\Serializer\Tests\Normalizer\Features\CallbacksTestTrait;
 use Symfony\Component\Serializer\Tests\Normalizer\Features\CircularReferenceTestTrait;
@@ -306,7 +306,7 @@ class GetSetMethodNormalizerTest extends TestCase
                 'foo_bar' => '@dunglas',
                 'symfony' => '@coopTilleuls',
                 'coop_tilleuls' => 'les-tilleuls.coop',
-            ], 'Symfony\Component\Serializer\Tests\Fixtures\GroupDummy', null, [GetSetMethodNormalizer::GROUPS => ['name_converter']])
+            ], 'Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy', null, [GetSetMethodNormalizer::GROUPS => ['name_converter']])
         );
     }
 
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
index 6b2474c145..66d578f1eb 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/ObjectNormalizerTest.php
@@ -29,7 +29,7 @@ use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\SerializerInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\CircularReferenceDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\OtherSerializedNameDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\Php74Dummy;
 use Symfony\Component\Serializer\Tests\Fixtures\SiblingHolder;
@@ -435,7 +435,7 @@ class ObjectNormalizerTest extends TestCase
                 'foo_bar' => '@dunglas',
                 'symfony' => '@coopTilleuls',
                 'coop_tilleuls' => 'les-tilleuls.coop',
-            ], 'Symfony\Component\Serializer\Tests\Fixtures\GroupDummy', null, [ObjectNormalizer::GROUPS => ['name_converter']])
+            ], 'Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy', null, [ObjectNormalizer::GROUPS => ['name_converter']])
         );
     }
 
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php
index 78d75471da..67989d200e 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/PropertyNormalizerTest.php
@@ -26,8 +26,8 @@ use Symfony\Component\Serializer\Normalizer\PropertyNormalizer;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Serializer\SerializerInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\Dummy;
-use Symfony\Component\Serializer\Tests\Fixtures\GroupDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\GroupDummyChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummyChild;
 use Symfony\Component\Serializer\Tests\Fixtures\Php74Dummy;
 use Symfony\Component\Serializer\Tests\Fixtures\PropertyCircularReferenceDummy;
 use Symfony\Component\Serializer\Tests\Fixtures\PropertySiblingHolder;
@@ -253,7 +253,7 @@ class PropertyNormalizerTest extends TestCase
                 'foo_bar' => '@dunglas',
                 'symfony' => '@coopTilleuls',
                 'coop_tilleuls' => 'les-tilleuls.coop',
-            ], 'Symfony\Component\Serializer\Tests\Fixtures\GroupDummy', null, [PropertyNormalizer::GROUPS => ['name_converter']])
+            ], 'Symfony\Component\Serializer\Tests\Fixtures\Annotations\GroupDummy', null, [PropertyNormalizer::GROUPS => ['name_converter']])
         );
     }
 
diff --git a/src/Symfony/Component/Serializer/Tests/SerializerTest.php b/src/Symfony/Component/Serializer/Tests/SerializerTest.php
index 80c430a7d4..36cd098af8 100644
--- a/src/Symfony/Component/Serializer/Tests/SerializerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/SerializerTest.php
@@ -39,9 +39,9 @@ use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 use Symfony\Component\Serializer\Normalizer\PropertyNormalizer;
 use Symfony\Component\Serializer\Normalizer\UnwrappingDenormalizer;
 use Symfony\Component\Serializer\Serializer;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummy;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummyFirstChild;
-use Symfony\Component\Serializer\Tests\Fixtures\AbstractDummySecondChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummy;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummyFirstChild;
+use Symfony\Component\Serializer\Tests\Fixtures\Annotations\AbstractDummySecondChild;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyFirstChildQuux;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyMessageInterface;
 use Symfony\Component\Serializer\Tests\Fixtures\DummyMessageNumberOne;