Merge branch '2.7' into 2.8

* 2.7:
  Added 'default' color
  [HttpFoundation] Reload the session after regenerating its id
  [HttpFoundation] Add a test case to confirm a bug in session migration
  [Serializer] Fix ClassMetadata::sleep()
  [2.6] Static Code Analysis for Components and Bundles
  [Finder] Command::addAtIndex() fails with Command instance argument
  [DependencyInjection] Freeze also FrozenParameterBag::remove
  [Twig][Bridge] replaced `extends` with `use` in bootstrap_3_horizontal_layout.html.twig
  fix CS
  fixed CS
  Add a way to reset the singleton
  [Security] allow to use `method` in XML configs
  [Serializer] Fix Groups tests.
  Remove duplicate example
  Remove var not used due to returning early (introduced in 8982c32)
  [Serializer] Fix Groups PHPDoc
  Enhance hhvm test skip message
  fix for legacy asset() with EmptyVersionStrategy
  [Form] Added upgrade notes for #15061

Annotation/Groups.php

@@ -30,7 +30,8 @@ class Groups
 
     /**
      * @param array $data
-     * @throws \InvalidArgumentException
+     *
+     * @throws InvalidArgumentException
      */
     public function __construct(array $data)
     {
@@ -52,7 +53,7 @@ public function __construct(array $data)
     }
 
     /**
-     * Gets groups
+     * Gets groups.
      *
      * @return array
      */

Mapping/ClassMetadata.php

@@ -110,7 +110,7 @@ public function __sleep()
     {
         return array(
             'name',
-            'attributes',
+            'attributesMetadata',
         );
     }
 }

Tests/Annotation/GroupsTest.php

@@ -19,23 +19,23 @@
 class GroupsTest extends \PHPUnit_Framework_TestCase
 {
     /**
-     * @expectedException \InvalidArgumentException
+     * @expectedException \Symfony\Component\Serializer\Exception\InvalidArgumentException
      */
     public function testEmptyGroupsParameter()
     {
         new Groups(array('value' => array()));
     }
 
     /**
-     * @expectedException \InvalidArgumentException
+     * @expectedException \Symfony\Component\Serializer\Exception\InvalidArgumentException
      */
     public function testNotAnArrayGroupsParameter()
     {
         new Groups(array('value' => 'coopTilleuls'));
     }
 
     /**
-     * @expectedException \InvalidArgumentException
+     * @expectedException \Symfony\Component\Serializer\Exception\InvalidArgumentException
      */
     public function testInvalidGroupsParameter()
     {

Tests/Mapping/AttributeMetadataTest.php

@@ -54,4 +54,14 @@ public function testMerge()
 
         $this->assertEquals(array('a', 'b', 'c'), $attributeMetadata1->getGroups());
     }
+
+    public function testSerialize()
+    {
+        $attributeMetadata = new AttributeMetadata('attribute');
+        $attributeMetadata->addGroup('a');
+        $attributeMetadata->addGroup('b');
+
+        $serialized = serialize($attributeMetadata);
+        $this->assertEquals($attributeMetadata, unserialize($serialized));
+    }
 }

Tests/Mapping/ClassMetadataTest.php

@@ -62,4 +62,21 @@ public function testMerge()
 
         $this->assertEquals(array('a1' => $ac1), $classMetadata2->getAttributesMetadata());
     }
+
+    public function testSerialize()
+    {
+        $classMetadata = new ClassMetadata('a');
+
+        $a1 = $this->getMock('Symfony\Component\Serializer\Mapping\AttributeMetadataInterface');
+        $a1->method('getName')->willReturn('b1');
+
+        $a2 = $this->getMock('Symfony\Component\Serializer\Mapping\AttributeMetadataInterface');
+        $a2->method('getName')->willReturn('b2');
+
+        $classMetadata->addAttributeMetadata($a1);
+        $classMetadata->addAttributeMetadata($a2);
+
+        $serialized = serialize($classMetadata);
+        $this->assertEquals($classMetadata, unserialize($serialized));
+    }
 }