feature #17630 [FrameworkBundle] Register the DateTimeNormalizer (dunglas)

This PR was squashed before being merged into the 3.1-dev branch (closes #17630).

Discussion
----------

[FrameworkBundle] Register the DateTimeNormalizer

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | todo

Commits
-------

5a76eb2 [FrameworkBundle] Register the DateTimeNormalizer

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -24,6 +24,7 @@
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Serializer\Normalizer\DataUriNormalizer;
+use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
 use Symfony\Component\Validator\Validation;
 
 /**
@@ -902,6 +903,13 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
             $definition->addTag('serializer.normalizer', ['priority' => -920]);
         }
 
+        if (class_exists('Symfony\Component\Serializer\Normalizer\DateTimeNormalizer')) {
+            // Run before serializer.normalizer.object
+            $definition = $container->register('serializer.normalizer.datetime', DateTimeNormalizer::class);
+            $definition->setPublic(false);
+            $definition->addTag('serializer.normalizer', array('priority' => -910));
+        }
+
         $loader->load('serializer.xml');
         $chainLoader = $container->getDefinition('serializer.mapping.chain_loader');
 

Tests/DependencyInjection/FrameworkExtensionTest.php

@@ -19,6 +19,7 @@
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\Serializer\Normalizer\DataUriNormalizer;
+use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
 
 abstract class FrameworkExtensionTest extends TestCase
 {
@@ -469,6 +470,21 @@ public function testDataUriNormalizerRegistered()
         $this->assertEquals(-920, $tag[0]['priority']);
     }
 
+    public function testDateTimeNormalizerRegistered()
+    {
+        if (!class_exists('Symfony\Component\Serializer\Normalizer\DateTimeNormalizer')) {
+            $this->markTestSkipped('The DateTimeNormalizer has been introduced in the Serializer Component version 3.1.');
+        }
+
+        $container = $this->createContainerFromFile('full');
+
+        $definition = $container->getDefinition('serializer.normalizer.datetime');
+        $tag = $definition->getTag('serializer.normalizer');
+
+        $this->assertEquals(DateTimeNormalizer::class, $definition->getClass());
+        $this->assertEquals(-910, $tag[0]['priority']);
+    }
+
     public function testAssetHelperWhenAssetsAreEnabled()
     {
         $container = $this->createContainerFromFile('full');