tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php | 1 -
 tests/src/Unit/Normalizer/ConfigEntityNormalizerTest.php              | 4 ++++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php b/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
index a1a7f63..8df89dc 100644
--- a/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
+++ b/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
@@ -420,7 +420,6 @@ class JsonApiDocumentTopLevelNormalizerTest extends JsonapiKernelTestBase {
       ]);
     $normalized = $jsonapi_doc_object->rasterizeValue();
     $this->assertTrue(empty($normalized['data']['attributes']['type']));
-    $this->assertTrue(!empty($normalized['data']['attributes']['uuid']));
     $this->assertSame($normalized['data']['attributes']['display_submitted'], TRUE);
     $this->assertSame($normalized['data']['id'], NodeType::load('article')->uuid());
     $this->assertSame($normalized['data']['type'], 'node_type--node_type');
diff --git a/tests/src/Unit/Normalizer/ConfigEntityNormalizerTest.php b/tests/src/Unit/Normalizer/ConfigEntityNormalizerTest.php
index 6679651..a0c3a66 100644
--- a/tests/src/Unit/Normalizer/ConfigEntityNormalizerTest.php
+++ b/tests/src/Unit/Normalizer/ConfigEntityNormalizerTest.php
@@ -4,6 +4,7 @@ namespace Drupal\Tests\jsonapi\Unit\Normalizer;
 
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 use Drupal\Core\Entity\EntityFieldManagerInterface;
+use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Field\FieldTypePluginManagerInterface;
 use Drupal\jsonapi\ResourceType\ResourceType;
@@ -54,8 +55,11 @@ class ConfigEntityNormalizerTest extends UnitTestCase {
    * @dataProvider normalizeProvider
    */
   public function testNormalize($input, $expected) {
+    $entity_type = $this->prophesize(EntityTypeInterface::class);
+    $entity_type->getKey('id')->willReturn('id');
     $entity = $this->prophesize(ConfigEntityInterface::class);
     $entity->toArray()->willReturn(['amet' => $input]);
+    $entity->getEntityType()->willReturn($entity_type->reveal());
     $entity->getCacheContexts()->willReturn([]);
     $entity->getCacheTags()->willReturn([]);
     $entity->getCacheMaxAge()->willReturn(-1);