diff --git a/core/tests/Drupal/Tests/Core/TypedData/MapDataNormalizeTest.php b/core/tests/Drupal/Tests/Core/TypedData/MapDataNormalizeTest.php
new file mode 100644
index 0000000000..874177dbbb
--- /dev/null
+++ b/core/tests/Drupal/Tests/Core/TypedData/MapDataNormalizeTest.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace Drupal\Tests\Core\TypedData;
+
+use Drupal\Core\TypedData\DataDefinition;
+use Drupal\Core\TypedData\MapDataDefinition;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * @group typedData
+ */
+class MapDataNormalizeTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+
+  public static $modules = ['system', 'serialization'];
+
+  /**
+   * The serializer type.
+   */
+  protected $serializer;
+
+  /**
+   * The typeDataManager.
+   */
+  protected $typedDataManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->serializer = \Drupal::service('serializer');
+    $this->typedDataManager = \Drupal::typedDataManager();
+
+  }
+
+  /**
+   * Test 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',
+    ];
+    $this->assertEquals($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',
+    ];
+    $this->assertEquals($expect_value, $data);
+  }
+
+  /**
+   * Builds some example type data object with no properties.
+   *
+   * @return \Drupal\Core\TypedData\TypedDataInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected function buildExampleTypedData() {
+    $tree = [
+      'key1' => 'value1',
+      'key2' => 'value2',
+    ];
+    $map_data_definition = MapDataDefinition::create();
+    $typed_data = $this->typedDataManager->create(
+      $map_data_definition,
+      $tree,
+      'test name'
+    );
+    return $typed_data;
+  }
+
+  /**
+   * Builds some example type data object with properties.
+   *
+   * @return \Drupal\Core\TypedData\TypedDataInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected function buildExampleTypedDataWithProperties() {
+    $tree = [
+      'key1' => 'value1',
+      'key2' => 'value2',
+    ];
+    $map_data_definition = MapDataDefinition::create();
+    foreach (array_keys($tree) as $property_name) {
+      $map_data_definition->setPropertyDefinition($property_name, DataDefinition::create('string'));
+    }
+    $typed_data = $this->typedDataManager->create(
+      $map_data_definition,
+      $tree,
+      'test name'
+    );
+
+    return $typed_data;
+  }
+
+}