diff --git a/tests/Models/NullSupportAppTest.php b/tests/Models/NullSupportAppTest.php
index 62d5926..665c973 100755
--- a/tests/Models/NullSupportAppTest.php
+++ b/tests/Models/NullSupportAppTest.php
@@ -47,6 +47,6 @@ final class NullSupportAppTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullSupportApp(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }
diff --git a/tests/Models/NullTicketElementTest.php b/tests/Models/NullTicketElementTest.php
index f993bc4..77bda5a 100755
--- a/tests/Models/NullTicketElementTest.php
+++ b/tests/Models/NullTicketElementTest.php
@@ -47,6 +47,6 @@ final class NullTicketElementTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullTicketElement(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }
diff --git a/tests/Models/NullTicketTest.php b/tests/Models/NullTicketTest.php
index 360c9ea..c2df437 100755
--- a/tests/Models/NullTicketTest.php
+++ b/tests/Models/NullTicketTest.php
@@ -47,6 +47,6 @@ final class NullTicketTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullTicket(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }