diff -u b/tests/src/Kernel/LinkStubReplicationTest.php b/tests/src/Kernel/LinkStubReplicationTest.php
--- b/tests/src/Kernel/LinkStubReplicationTest.php
+++ b/tests/src/Kernel/LinkStubReplicationTest.php
@@ -42,13 +42,14 @@
     $this->installEntitySchema('replication_log');
     $this->installEntitySchema('workspace');
     $this->installEntitySchema('node');
+    $this->installEntitySchema('user');
     $this->installSchema('key_value', ['key_value_sorted']);
     $this->installSchema('system', ['sequences']);
     $this->installSchema('node', ['node_access']);
     $this->installConfig(['multiversion', 'replication']);
+    Workspace::create(['machine_name' => 'live', 'label' => 'Live', 'type' => 'basic'])->save();
     $this->container->get('multiversion.manager')->enableEntityTypes();
     $this->serializer = $this->container->get('serializer');
-    Workspace::create(['machine_name' => 'live', 'label' => 'Live', 'type' => 'basic'])->save();
     NodeType::create(['type' => 'article_with_link', 'name' => 'article_with_link'])->save();
     NodeType::create(['type' => 'article', 'name' => 'article'])->save();
     $this->createLinkField('node', 'article_with_link', 'field_link');
diff -u b/tests/src/Kernel/Normalizer/LinkItemNormalizerTest.php b/tests/src/Kernel/Normalizer/LinkItemNormalizerTest.php
--- b/tests/src/Kernel/Normalizer/LinkItemNormalizerTest.php
+++ b/tests/src/Kernel/Normalizer/LinkItemNormalizerTest.php
@@ -119,7 +119,11 @@
           ['value' => TRUE],
         ],
         'user_id' => [
-          ['target_id' => $this->values['user_id']],
+          [
+            'entity_type_id' => 'user',
+            'target_uuid' => $this->user->uuid(),
+            'username' => $this->user->getAccountName(),
+          ],
         ],
         '_rev' => [
           ['value' => $this->entity->_rev->value],
@@ -172,14 +176,6 @@
       $expected['en']['field_test_text'][0]['processed'] = '';
     }
 
-    if (version_compare($minor_version, '8.7', '>=')) {
-      $expected['en']['user_id'] = [[
-        'entity_type_id' => 'user',
-        'target_uuid' => $this->user->uuid(),
-        'username' => $this->user->getAccountName(),
-      ]];
-    }
-
     // Test normalize.
     $normalized = $this->serializer->normalize($this->entity);
     foreach (array_keys($expected) as $key) {
only in patch2:
unchanged:
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,12 @@ env:
   - MAKE_FILE=drupal-8.6.x.make.yml
   - MAKE_FILE=drupal-8.7.x.make.yml
 
+matrix:
+  allow_failures:
+    - php: 7.3
+      env: MAKE_FILE=drupal-8.5.x.make.yml
+  fast_finish: true
+
 services:
   - mysql
 
only in patch2:
unchanged:
--- a/tests/src/Kernel/Normalizer/EntityReferenceItemNormalizerTest.php
+++ b/tests/src/Kernel/Normalizer/EntityReferenceItemNormalizerTest.php
@@ -15,14 +15,6 @@ class EntityReferenceItemNormalizerTest extends NormalizerTestBase {
 
   protected $entityClass = 'Drupal\entity_test\Entity\EntityTest';
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-    $this->installSchema('system', ['sequences']);
-  }
-
   /**
    * Tests normalization of entity reference fields that reference users.
    *