diff --git a/tests/src/Functional/JsonApiFunctionalToJsonTest.php b/tests/src/Functional/JsonApiFunctionalToJsonTest.php
index 651059e..d65d71c 100644
--- a/tests/src/Functional/JsonApiFunctionalToJsonTest.php
+++ b/tests/src/Functional/JsonApiFunctionalToJsonTest.php
@@ -29,15 +29,16 @@ class JsonApiFunctionalToJsonTest extends BrowserTestBase {
   public function testService() {
     $node = $this->createNode();
 
-    $string = \Drupal::service('jsonapi.resource.to_json', ['resource' => $node])->raw();
-    $this->verbose(print_r($string, TRUE));
-    $this->assertFalse(empty($string));
+    $raw = \Drupal::service('jsonapi.resource.to_json', ['resource' => $node])->raw();
+    $this->verbose(print_r($raw, TRUE));
+    $this->assertFalse(empty($raw));
 
     $json = \Drupal::service('jsonapi.resource.to_json', ['resource' => $node])->json();
     $this->verbose(print_r($json, TRUE));
     $this->assertFalse(empty($json));
 
-    $this->assertSame(Json::decode($string), $json);
+    $this->assertEquals(Json::decode($raw), $json);
+    $this->assertNotEquals($raw, $json);
   }
 
 }