[Validator] Fix use of GroupSequenceProvider in child classes

Author: linniksa

Mapping/ClassMetadata.php

@@ -381,6 +381,10 @@ public function addGetterMethodConstraints($property, $method, array $constraint
      */
     public function mergeConstraints(ClassMetadata $source)
     {
+        if ($source->isGroupSequenceProvider()) {
+            $this->setGroupSequenceProvider(true);
+        }
+
         foreach ($source->getConstraints() as $constraint) {
             $this->addConstraint(clone $constraint);
         }

Tests/Fixtures/GroupSequenceProviderChildEntity.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\Validator\Tests\Fixtures;
+
+class GroupSequenceProviderChildEntity extends GroupSequenceProviderEntity
+{
+}

Tests/Mapping/ClassMetadataTest.php

@@ -24,6 +24,7 @@ class ClassMetadataTest extends TestCase
     const CLASSNAME = 'Symfony\Component\Validator\Tests\Fixtures\Entity';
     const PARENTCLASS = 'Symfony\Component\Validator\Tests\Fixtures\EntityParent';
     const PROVIDERCLASS = 'Symfony\Component\Validator\Tests\Fixtures\GroupSequenceProviderEntity';
+    const PROVIDERCHILDCLASS = 'Symfony\Component\Validator\Tests\Fixtures\GroupSequenceProviderChildEntity';
 
     protected $metadata;
 
@@ -301,6 +302,17 @@ public function testGroupSequenceProvider()
         $this->assertTrue($metadata->isGroupSequenceProvider());
     }
 
+    public function testMergeConstraintsMergesGroupSequenceProvider()
+    {
+        $parent = new ClassMetadata(self::PROVIDERCLASS);
+        $parent->setGroupSequenceProvider(true);
+
+        $metadata = new ClassMetadata(self::PROVIDERCHILDCLASS);
+        $metadata->mergeConstraints($parent);
+
+        $this->assertTrue($metadata->isGroupSequenceProvider());
+    }
+
     /**
      * https://github.com/symfony/symfony/issues/11604.
      */
@@ -309,13 +321,3 @@ public function testGetPropertyMetadataReturnsEmptyArrayWithoutConfiguredMetadat
         $this->assertCount(0, $this->metadata->getPropertyMetadata('foo'), '->getPropertyMetadata() returns an empty collection if no metadata is configured for the given property');
     }
 }
-
-class ParentClass
-{
-    public $example = 0;
-}
-
-class ChildClass extends ParentClass
-{
-    public $example = 1;    // overrides parent property of same name
-}