diff --git a/tests/Models/NullPromotionAttributeTest.php b/tests/Models/NullPromotionAttributeTest.php
index 4548772..eb19963 100644
--- a/tests/Models/NullPromotionAttributeTest.php
+++ b/tests/Models/NullPromotionAttributeTest.php
@@ -37,7 +37,7 @@ final class NullPromotionAttributeTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullPromotionAttribute(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullPromotionAttributeTypeTest.php b/tests/Models/NullPromotionAttributeTypeTest.php
index e294877..534d8c0 100644
--- a/tests/Models/NullPromotionAttributeTypeTest.php
+++ b/tests/Models/NullPromotionAttributeTypeTest.php
@@ -37,7 +37,7 @@ final class NullPromotionAttributeTypeTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullPromotionAttributeType(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullPromotionAttributeValueTest.php b/tests/Models/NullPromotionAttributeValueTest.php
index 7570da0..305a1bd 100644
--- a/tests/Models/NullPromotionAttributeValueTest.php
+++ b/tests/Models/NullPromotionAttributeValueTest.php
@@ -37,7 +37,7 @@ final class NullPromotionAttributeValueTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullPromotionAttributeValue(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullPromotionTest.php b/tests/Models/NullPromotionTest.php
index f6727d1..2a1edeb 100644
--- a/tests/Models/NullPromotionTest.php
+++ b/tests/Models/NullPromotionTest.php
@@ -37,7 +37,7 @@ final class NullPromotionTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullPromotion(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**