tests/src/Functional/TermTest.php | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/tests/src/Functional/TermTest.php b/tests/src/Functional/TermTest.php
index c50dddc..5c3e12d 100644
--- a/tests/src/Functional/TermTest.php
+++ b/tests/src/Functional/TermTest.php
@@ -7,6 +7,7 @@ use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Url;
+use Drupal\jsonapi\ResourceResponse;
 use Drupal\taxonomy\Entity\Term;
 use Drupal\taxonomy\Entity\Vocabulary;
 use Drupal\Tests\rest\Functional\BcTimestampNormalizerUnixTestTrait;
@@ -270,7 +271,7 @@ class TermTest extends ResourceTestBase {
    */
   protected function getExpectedGetRelationshipDocumentData($relationship_field_name, EntityInterface $entity = NULL) {
     $data = parent::getExpectedGetRelationshipDocumentData($relationship_field_name, $entity);
-    if ($relationship_field_name === 'parent') {
+    if ($relationship_field_name === 'parent' && floatval(\Drupal::VERSION) >= 8.6) {
       $data = [
         0 => [
           'id' => 'virtual',
@@ -284,6 +285,28 @@ class TermTest extends ResourceTestBase {
   /**
    * {@inheritdoc}
    */
+  protected function getExpectedRelatedResponses(array $relationship_field_names, array $request_options, EntityInterface $entity = NULL) {
+    $responses = parent::getExpectedRelatedResponses($relationship_field_names, $request_options, $entity);
+    if ($responses['parent']->getStatusCode() === 404 && floatval(\Drupal::VERSION) >= 8.6) {
+      $responses['parent'] = new ResourceResponse([
+        'data' => [],
+        'jsonapi' => [
+          'meta' => [
+            'links' => [
+              'self' => 'http://jsonapi.org/format/1.0/',
+            ],
+          ],
+          'version' => '1.0',
+        ],
+        'links' => ['self' => static::getRelatedLink(static::toResourceIdentifier($this->entity), 'parent')],
+      ]);
+    }
+    return $responses;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   protected function getPostDocument() {
     return [
       'data' => [