diff --git a/tests/Models/NullAccountRelationTest.php b/tests/Models/NullAccountRelationTest.php
index d748977..8a78f81 100644
--- a/tests/Models/NullAccountRelationTest.php
+++ b/tests/Models/NullAccountRelationTest.php
@@ -37,7 +37,7 @@ final class NullAccountRelationTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullAccountRelation(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullGroupRelationTest.php b/tests/Models/NullGroupRelationTest.php
index 360fbcd..2f7febb 100644
--- a/tests/Models/NullGroupRelationTest.php
+++ b/tests/Models/NullGroupRelationTest.php
@@ -37,7 +37,7 @@ final class NullGroupRelationTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullGroupRelation(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullTaskAttributeTest.php b/tests/Models/NullTaskAttributeTest.php
index c3d1edf..7152127 100644
--- a/tests/Models/NullTaskAttributeTest.php
+++ b/tests/Models/NullTaskAttributeTest.php
@@ -37,7 +37,7 @@ final class NullTaskAttributeTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullTaskAttribute(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullTaskAttributeTypeTest.php b/tests/Models/NullTaskAttributeTypeTest.php
index 8035a4c..e60ca05 100644
--- a/tests/Models/NullTaskAttributeTypeTest.php
+++ b/tests/Models/NullTaskAttributeTypeTest.php
@@ -37,7 +37,7 @@ final class NullTaskAttributeTypeTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullTaskAttributeType(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullTaskAttributeValueTest.php b/tests/Models/NullTaskAttributeValueTest.php
index 2442dd5..e8ab325 100644
--- a/tests/Models/NullTaskAttributeValueTest.php
+++ b/tests/Models/NullTaskAttributeValueTest.php
@@ -37,7 +37,7 @@ final class NullTaskAttributeValueTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullTaskAttributeValue(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**
diff --git a/tests/Models/NullTaskSeenTest.php b/tests/Models/NullTaskSeenTest.php
index 8b01b15..b179fb1 100644
--- a/tests/Models/NullTaskSeenTest.php
+++ b/tests/Models/NullTaskSeenTest.php
@@ -37,7 +37,7 @@ final class NullTaskSeenTest extends \PHPUnit\Framework\TestCase
     public function testId() : void
     {
         $null = new NullTaskSeen(2);
-        self::assertEquals(2, $null->getId());
+        self::assertEquals(2, $null->id);
     }
 
     /**