diff --git a/tests/Models/NullEquipmentTest.php b/tests/Models/NullEquipmentTest.php
index f9225b8..748b8c4 100644
--- a/tests/Models/NullEquipmentTest.php
+++ b/tests/Models/NullEquipmentTest.php
@@ -47,6 +47,6 @@ final class NullEquipmentTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullEquipment(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }
diff --git a/tests/Models/NullInspectionTest.php b/tests/Models/NullInspectionTest.php
index 4230394..0ed8675 100644
--- a/tests/Models/NullInspectionTest.php
+++ b/tests/Models/NullInspectionTest.php
@@ -47,6 +47,6 @@ final class NullInspectionTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullInspection(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }