diff --git a/tests/Models/NullEditorDocHistoryTest.php b/tests/Models/NullEditorDocHistoryTest.php
index b165227..9878894 100644
--- a/tests/Models/NullEditorDocHistoryTest.php
+++ b/tests/Models/NullEditorDocHistoryTest.php
@@ -47,6 +47,6 @@ final class NullEditorDocHistoryTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullEditorDocHistory(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }
diff --git a/tests/Models/NullEditorDocTest.php b/tests/Models/NullEditorDocTest.php
index 7fc854d..88bb546 100755
--- a/tests/Models/NullEditorDocTest.php
+++ b/tests/Models/NullEditorDocTest.php
@@ -47,6 +47,6 @@ final class NullEditorDocTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullEditorDoc(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }