diff --git a/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonAnonTest.php b/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonAnonTest.php
new file mode 100644
index 0000000..5abe6c4
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonAnonTest.php
@@ -0,0 +1,76 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\MenuLinkContent;
+
+use Drupal\Core\Cache\Cache;
+use Drupal\Tests\hal\Functional\EntityResource\HalEntityNormalizationTrait;
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+use Drupal\Tests\rest\Functional\EntityResource\MenuLinkContent\MenuLinkContentResourceTestBase;
+
+/**
+ * MenuLinkContent anonymous hal json test.
+ *
+ * @group hal
+ */
+class MenuLinkContentHalJsonAnonTest extends MenuLinkContentResourceTestBase {
+
+  use HalEntityNormalizationTrait;
+  use AnonResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['hal'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'hal_json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/hal+json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedNormalizedEntity() {
+    $default_normalization = parent::getExpectedNormalizedEntity();
+
+    $normalization = $this->applyHalFieldNormalization($default_normalization);
+
+    return $normalization + [
+      '_links' => [
+        'self' => [
+          'href' => $this->baseUrl . '/admin/structure/menu/item/1/edit?_format=hal_json',
+        ],
+        'type' => [
+          'href' => $this->baseUrl . '/rest/type/menu_link_content/menu_link_content',
+        ],
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getNormalizedPostEntity() {
+    return parent::getNormalizedPostEntity() + [
+      '_links' => [
+        'type' => [
+          'href' => $this->baseUrl . '/rest/type/menu_link_content/menu_link_content',
+        ],
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedCacheContexts() {
+    // The 'url.site' cache context is added for '_links' in the response.
+    return Cache::mergeTags(parent::getExpectedCacheContexts(), ['url.site']);
+  }
+
+}
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonBasicAuthTest.php b/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonBasicAuthTest.php
new file mode 100644
index 0000000..22e4c9a
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonBasicAuthTest.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\MenuLinkContent;
+
+use Drupal\Tests\hal\Functional\EntityResource\MenuLinkContent\MenuLinkContentHalJsonAnonTest;
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+
+/**
+ * MenuLinkContent basic auth hal json test.
+ *
+ * @group hal
+ */
+class MenuLinkContentHalJsonBasicAuthTest extends MenuLinkContentHalJsonAnonTest {
+
+  use BasicAuthResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+}
diff --git a/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonCookieTest.php b/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonCookieTest.php
new file mode 100644
index 0000000..fbc5901
--- /dev/null
+++ b/core/modules/hal/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentHalJsonCookieTest.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Drupal\Tests\hal\Functional\EntityResource\MenuLinkContent;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+
+/**
+ * MenuLinkContent cookie hal json test.
+ *
+ * @group hal
+ */
+class EntityTestHalJsonCookieTest extends MenuLinkContentHalJsonAnonTest {
+
+  use CookieResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index e9d9c48..e904728 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -561,7 +561,7 @@ public function testPost() {
     // DX: 422 when invalid entity: multiple values sent for single-value field.
     $response = $this->request('POST', $url, $request_options);
     $label_field = $this->entity->getEntityType()->hasKey('label') ? $this->entity->getEntityType()->getKey('label') : static::$labelFieldName;
-    $label_field_capitalized = ucfirst($label_field);
+    $label_field_capitalized = $this->entity->getFieldDefinition($label_field)->getLabel();
     $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\n$label_field: $label_field_capitalized: this field cannot hold more than 1 values.\n", $response);
 
 
@@ -751,7 +751,7 @@ public function testPatch() {
     // DX: 422 when invalid entity: multiple values sent for single-value field.
     $response = $this->request('PATCH', $url, $request_options);
     $label_field = $this->entity->getEntityType()->hasKey('label') ? $this->entity->getEntityType()->getKey('label') : static::$labelFieldName;
-    $label_field_capitalized = ucfirst($label_field);
+    $label_field_capitalized = $this->entity->getFieldDefinition($label_field)->getLabel();
     $this->assertResourceErrorResponse(422, "Unprocessable Entity: validation failed.\n$label_field: $label_field_capitalized: this field cannot hold more than 1 values.\n", $response);
 
 
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonAnonTest.php b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonAnonTest.php
new file mode 100644
index 0000000..219cc53
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonAnonTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\MenuLinkContent;
+
+use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
+
+/**
+ * @group rest
+ */
+class MenuLinkContentJsonAnonTest extends MenuLinkContentResourceTestBase {
+
+  use AnonResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonBasicAuthTest.php b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonBasicAuthTest.php
new file mode 100644
index 0000000..9be9e55
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonBasicAuthTest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\MenuLinkContent;
+
+use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
+use Drupal\Tests\rest\Functional\JsonBasicAuthWorkaroundFor2805281Trait;
+
+/**
+ * @group rest
+ */
+class MenuLinkContentJsonBasicAuthTest extends MenuLinkContentResourceTestBase {
+
+  use BasicAuthResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['basic_auth'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'basic_auth';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonCookieTest.php b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonCookieTest.php
new file mode 100644
index 0000000..155b853
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentJsonCookieTest.php
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\rest\Functional\EntityResource\MenuLinkContent\MenuLinkContentJsonCookieTest.
+ */
+
+namespace Drupal\Tests\rest\Functional\EntityResource\MenuLinkContent;
+
+use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
+
+/**
+ * @group rest
+ */
+class MenuLinkContentJsonCookieTest extends MenuLinkContentResourceTestBase {
+
+  use CookieResourceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $format = 'json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $mimeType = 'application/json';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $auth = 'cookie';
+
+}
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentResourceTestBase.php
new file mode 100644
index 0000000..37117eb
--- /dev/null
+++ b/core/modules/rest/tests/src/Functional/EntityResource/MenuLinkContent/MenuLinkContentResourceTestBase.php
@@ -0,0 +1,177 @@
+<?php
+
+namespace Drupal\Tests\rest\Functional\EntityResource\MenuLinkContent;
+
+use Drupal\menu_link_content\Entity\MenuLinkContent;
+use Drupal\Tests\rest\Functional\EntityResource\EntityResourceTestBase;
+
+/**
+ * ResourceTestBase for MenuLinkContent entity.
+ */
+abstract class MenuLinkContentResourceTestBase extends EntityResourceTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['menu_link_content'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $entityTypeId = 'menu_link_content';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $patchProtectedFieldNames = [
+    'changed'
+  ];
+
+  /**
+   * The MenuLinkContent entity.
+   *
+   * @var \Drupal\menu_link_content\MenuLinkContentInterface
+   */
+  protected $entity;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUpAuthorization($method) {
+    switch ($method) {
+      case 'GET':
+      case 'POST':
+      case 'PATCH':
+      case 'DELETE':
+        $this->grantPermissionsToTestedRole(['administer menu']);
+        break;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function createEntity() {
+    $menu_link = MenuLinkContent::create([
+      'id' => 'llama',
+      'title' => 'Llama Gabilondo',
+      'description' => 'Llama Gabilondo',
+      'link' => 'https://nl.wikipedia.org/wiki/Llama',
+      'weight' => 0,
+      'menu_name' => 'main',
+    ]);
+    $menu_link->save();
+
+    return $menu_link;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getNormalizedPostEntity() {
+    return [
+      'title' => [
+        [
+          'value' => 'Dramallama',
+        ],
+      ],
+      'link' => [
+        [
+          'uri' => 'http://www.urbandictionary.com/define.php?term=drama%20llama',
+        ],
+      ],
+      'bundle' => [
+        [
+          'value' => 'menu_link_content',
+        ]
+      ]
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedNormalizedEntity() {
+    return [
+       'uuid' => [
+         [
+           'value' => $this->entity->uuid(),
+         ],
+       ],
+       'id' => [
+         [
+           'value' => '1',
+         ],
+       ],
+       'title' => [
+         [
+           'value' => 'Llama Gabilondo',
+         ],
+       ],
+       'link' => [
+         [
+           'uri' => 'https://nl.wikipedia.org/wiki/Llama',
+           'title' => NULL,
+           'options' => [],
+         ],
+       ],
+       'weight' => [
+         [
+           'value' => 0,
+         ],
+       ],
+       'menu_name' => [
+         [
+           'value' => 'main',
+         ],
+       ],
+       'langcode' => [
+         [
+           'value' => 'en',
+         ],
+       ],
+       'bundle' => [
+         [
+           'value' => 'menu_link_content',
+         ],
+       ],
+       'description' => [
+         [
+           'value' => 'Llama Gabilondo',
+         ],
+       ],
+       'external' => [
+         [
+           'value' => '0',
+         ],
+       ],
+       'rediscover' => [
+         [
+           'value' => '0',
+         ],
+       ],
+       'expanded' => [
+         [
+           'value' => '0',
+         ],
+       ],
+       'enabled' => [
+         [
+           'value' => TRUE,
+         ],
+       ],
+       'changed' => [
+         [
+           'value' => $this->entity->getChangedTime(),
+         ],
+       ],
+       'default_langcode' => [
+         [
+           'value' => '1',
+         ],
+       ],
+      'parent' => [],
+     ];
+  }
+
+}