bug symfony#57678 [Validator] Add setGroupProvider to AttributeLoader (Maximilian Zumbansen)

This PR was merged into the 7.0 branch.

Discussion
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[Validator] Add `setGroupProvider` to `AttributeLoader`

| Q             | A
| ------------- | ---
| Branch?       | 7.0
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Issues        | Fix symfony#57677 <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

Was introduced in `AnnotationLoader` and got removed during the 6.4->7.0 switch to the `AttributeLoader`. Fixes issue [symfony#57677](symfony#57677).

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Commits
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a965d68 [Validator] add setGroupProvider to AttributeLoader

Author: nicolas-grekas

src/Symfony/Component/Validator/Mapping/Loader/AttributeLoader.php

@@ -37,6 +37,7 @@ public function loadClassMetadata(ClassMetadata $metadata): bool
             if ($constraint instanceof GroupSequence) {
                 $metadata->setGroupSequence($constraint->groups);
             } elseif ($constraint instanceof GroupSequenceProvider) {
+                $metadata->setGroupProvider($constraint->provider);
                 $metadata->setGroupSequenceProvider(true);
             } elseif ($constraint instanceof Constraint) {
                 $metadata->addConstraint($constraint);

src/Symfony/Component/Validator/Tests/Mapping/Loader/AttributeLoaderTest.php

@@ -210,6 +210,22 @@ public function testLoadGroupSequenceProviderAttribute()
         $this->assertEquals($expected, $metadata);
     }
 
+    public function testLoadExternalGroupSequenceProvider()
+    {
+        $loader = $this->createAttributeLoader();
+        $namespace = $this->getFixtureAttributeNamespace();
+
+        $metadata = new ClassMetadata($namespace.'\GroupProviderDto');
+        $loader->loadClassMetadata($metadata);
+
+        $expected = new ClassMetadata($namespace.'\GroupProviderDto');
+        $expected->setGroupProvider('Symfony\Component\Validator\Tests\Dummy\DummyGroupProvider');
+        $expected->setGroupSequenceProvider(true);
+        $expected->getReflectionClass();
+
+        $this->assertEquals($expected, $metadata);
+    }
+
     protected function createAttributeLoader(): AttributeLoader
     {
         return new AttributeLoader();
@@ -219,4 +235,9 @@ protected function getFixtureNamespace(): string
     {
         return 'Symfony\Component\Validator\Tests\Fixtures\NestedAttribute';
     }
+
+    protected function getFixtureAttributeNamespace(): string
+    {
+        return 'Symfony\Component\Validator\Tests\Fixtures\Attribute';
+    }
 }