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diff --git a/web/core/modules/serialization/tests/src/Kernel/MapDataNormalizerTest.php b/web/core/modules/serialization/tests/src/Kernel/MapDataNormalizerTest.php
new file mode 100644
index 000000000..32dc08265
--- /dev/null
+++ b/web/core/modules/serialization/tests/src/Kernel/MapDataNormalizerTest.php
@@ -0,0 +1,136 @@
+<?php
+
+namespace Drupal\Tests\serialization\Kernel;
+
+use Drupal\Core\TypedData\DataDefinition;
+use Drupal\Core\TypedData\MapDataDefinition;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * @group typedData
+ */
+class MapDataNormalizerTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['system', 'serialization'];
+
+  /**
+   * The serializer service.
+   *
+   * @var \Symfony\Component\Serializer\Serializer
+   */
+  protected $serializer;
+
+  /**
+   * The typed data manager.
+   *
+   * @var \Drupal\Core\TypedData\TypedDataManagerInterface
+   */
+  protected $typedDataManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->serializer = \Drupal::service('serializer');
+    $this->typedDataManager = \Drupal::typedDataManager();
+  }
+
+  /**
+   * Tests whether map data can be normalized.
+   */
+  public function testMapNormalize() {
+    $typed_data = $this->buildExampleTypedData();
+    $data = $this->serializer->normalize($typed_data, 'json');
+    $expect_value = [
+      'key1' => 'value1',
+      'key2' => 'value2',
+      'key3' => 3,
+      'key4' => [
+        0 => TRUE,
+        1 => 'value6',
+        'key7' => 'value7',
+      ],
+    ];
+    $this->assertSame($expect_value, $data);
+  }
+
+  /**
+   * Test whether map data with properties can be normalized.
+   */
+  public function testMapWithPropertiesNormalize() {
+    $typed_data = $this->buildExampleTypedDataWithProperties();
+    $data = $this->serializer->normalize($typed_data, 'json');
+    $expect_value = [
+      'key1' => 'value1',
+      'key2' => 'value2',
+      'key3' => 3,
+      'key4' => [
+        0 => TRUE,
+        1 => 'value6',
+        'key7' => 'value7',
+      ],
+    ];
+    $this->assertSame($expect_value, $data);
+  }
+
+  /**
+   * Builds some example typed data object with no properties.
+   */
+  protected function buildExampleTypedData() {
+    $tree = [
+      'key1' => 'value1',
+      'key2' => 'value2',
+      'key3' => 3,
+      'key4' => [
+        0 => TRUE,
+        1 => 'value6',
+        'key7' => 'value7',
+      ],
+    ];
+    $map_data_definition = MapDataDefinition::create();
+    $typed_data = $this->typedDataManager->create(
+      $map_data_definition,
+      $tree,
+      'test name'
+    );
+    return $typed_data;
+  }
+
+  /**
+   * Builds some example typed data object with properties.
+   */
+  protected function buildExampleTypedDataWithProperties() {
+    $tree = [
+      'key1' => 'value1',
+      'key2' => 'value2',
+      'key3' => 3,
+      'key4' => [
+        0 => TRUE,
+        1 => 'value6',
+        'key7' => 'value7',
+      ],
+    ];
+    $map_data_definition = MapDataDefinition::create()
+      ->setPropertyDefinition('key1', DataDefinition::create('string'))
+      ->setPropertyDefinition('key2', DataDefinition::create('string'))
+      ->setPropertyDefinition('key3', DataDefinition::create('integer'))
+      ->setPropertyDefinition('key4', MapDataDefinition::create()
+        ->setPropertyDefinition(0, DataDefinition::create('boolean'))
+        ->setPropertyDefinition(1, DataDefinition::create('string'))
+        ->setPropertyDefinition('key7', DataDefinition::create('string'))
+    );
+
+    $typed_data = $this->typedDataManager->create(
+      $map_data_definition,
+      $tree,
+      'test name'
+    );
+
+    return $typed_data;
+  }
+
+}