diff -u b/src/DefaultContentServiceProvider.php b/src/DefaultContentServiceProvider.php
--- b/src/DefaultContentServiceProvider.php
+++ b/src/DefaultContentServiceProvider.php
@@ -23,6 +23,7 @@
       // Add a normalizer service for term entities.
       $service_definition = new Definition(TermEntityNormalizer::class, [
         new Reference('hal.link_manager'),
+        new Reference('entity.manager'),
         new Reference('module_handler'),
       ]);
       // The priority must be higher than that of
diff -u b/tests/src/Kernel/ExporterIntegrationTest.php b/tests/src/Kernel/ExporterIntegrationTest.php
--- b/tests/src/Kernel/ExporterIntegrationTest.php
+++ b/tests/src/Kernel/ExporterIntegrationTest.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Tests\default_content\Kernel;
 
-use Drupal\default_content\Exporter;
 use Drupal\field\Tests\EntityReference\EntityReferenceTestTrait;
 use Drupal\KernelTests\KernelTestBase;
 use Drupal\node\Entity\Node;
@@ -34,20 +33,12 @@
   protected $exporter;
 
   /**
-   * The link manager service.
-   *
-   * @var \Drupal\hal\LinkManager\LinkManager
-   */
-  protected $linkManager;
-
-  /**
    * {@inheritdoc}
    */
   protected function setUp() {
     parent::setUp();
 
     $this->installSchema('system', ['router', 'sequences']);
-    $this->linkManager = $this->getLinkManager();
   }
 
   /**
@@ -69,7 +60,7 @@
 
     /** @var \Symfony\Component\Serializer\Serializer $serializer */
     $serializer = \Drupal::service('serializer');
-    $this->linkManager
+    $this->getLinkManager()
       ->setLinkDomain($this->container->getParameter('default_content.link_domain'));
     $expected = $serializer->serialize($term, 'hal_json', ['json_encode_options' => JSON_PRETTY_PRINT]);
 
@@ -122,7 +113,7 @@
 
     /** @var \Symfony\Component\Serializer\Serializer $serializer */
     $serializer = \Drupal::service('serializer');
-    $this->linkManager
+    $this->getLinkManager()
       ->setLinkDomain($this->container->getParameter('default_content.link_domain'));
     $expected_node = $serializer->serialize($node, 'hal_json', ['json_encode_options' => JSON_PRETTY_PRINT]);
     $expected_user = $serializer->serialize($user, 'hal_json', ['json_encode_options' => JSON_PRETTY_PRINT]);
@@ -186,7 +177,7 @@
     $node->save();
     $node = Node::load($node->id());
     $serializer = \Drupal::service('serializer');
-    $this->linkManager
+    $this->getLinkManager()
       ->setLinkDomain($this->container->getParameter('default_content.link_domain'));
     $expected_node = $serializer->serialize($node, 'hal_json', ['json_encode_options' => JSON_PRETTY_PRINT]);
 
@@ -219,7 +210,7 @@
 
    * @see https://www.drupal.org/node/2830467
    *
-   * @return \Drupal\hal\LinkManager\LinkManager|\Drupal\rest\LinkManager\LinkManager
+   * @return \Drupal\hal\LinkManager\LinkManager
    *   The link manager service.
    */
   protected function getLinkManager() {
only in patch2:
unchanged:
--- a/tests/src/Functional/DefaultContentTest.php
+++ b/tests/src/Functional/DefaultContentTest.php
@@ -3,9 +3,9 @@
 namespace Drupal\Tests\default_content\Functional;
 
 use Drupal\Core\Config\FileStorage;
-use Drupal\simpletest\BrowserTestBase;
 use Drupal\simpletest\ContentTypeCreationTrait;
 use Drupal\simpletest\NodeCreationTrait;
+use Drupal\Tests\BrowserTestBase;
 
 /**
  * Test import of default content.