diff --git a/tests/DetectsEnumVersion.php b/tests/DetectsEnumVersion.php
index 5862707..c613159 100644
--- a/tests/DetectsEnumVersion.php
+++ b/tests/DetectsEnumVersion.php
@@ -20,6 +20,10 @@ trait DetectsEnumVersion
 {
     private function getEnumVersion(): string
     {
+        if (method_exists(Enum::class, 'hasNot')) {
+            return '4.0.0';
+        }
+
         return defined(Enum::class . '::__DEFAULT') ? '3.0.0' : '2.3.0';
     }
 
diff --git a/tests/EnumAccessorTest.php b/tests/EnumAccessorTest.php
index 021c272..a0d981d 100644
--- a/tests/EnumAccessorTest.php
+++ b/tests/EnumAccessorTest.php
@@ -14,6 +14,7 @@
 
 namespace Konekt\Enum\Eloquent\Tests;
 
+use Konekt\Enum\Eloquent\Tests\Models\BillingRule;
 use Konekt\Enum\Eloquent\Tests\Models\Client;
 use Konekt\Enum\Eloquent\Tests\Models\Order;
 use Konekt\Enum\Eloquent\Tests\Models\OrderStatus;
@@ -140,4 +141,22 @@ public function it_doesnt_break_related_properties()
         $this->assertInstanceOf(Client::class, $order->client);
         $this->assertEquals($client->id, $order->client->id);
     }
+
+    /** @test */
+    public function it_works_with_integer_database_fields()
+    {
+        $clientAny = Client::create(['name' => 'Pawel Jedrzejewsky']);
+        $clientInvoiceOnly = Client::create(['name' => 'Pawel Jedrzejewsky', 'billing_rule' => 1]);
+        $clientNoInvoice = Client::create(['name' => 'Pawel Jedrzejewsky', 'billing_rule' => 0]);
+
+        $this->assertInstanceOf(BillingRule::class, $clientAny->billing_rule);
+        $this->assertNull($clientAny->billing_rule->value());
+
+        $this->assertInstanceOf(BillingRule::class, $clientInvoiceOnly->billing_rule);
+        $this->assertEquals(1, $clientInvoiceOnly->billing_rule->value());
+
+        $this->assertInstanceOf(BillingRule::class, $clientNoInvoice->billing_rule);
+        $this->assertEquals(0, $clientNoInvoice->billing_rule->value());
+
+    }
 }
diff --git a/tests/Models/BillingRule.php b/tests/Models/BillingRule.php
new file mode 100644
index 0000000..861538f
--- /dev/null
+++ b/tests/Models/BillingRule.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Contains the BillingRule class.
+ *
+ * @copyright   Copyright (c) 2022 Attila Fulop
+ * @author      Attila Fulop
+ * @license     MIT
+ * @since       2022-03-10
+ *
+ */
+
+namespace Konekt\Enum\Eloquent\Tests\Models;
+
+use Konekt\Enum\Enum;
+
+class BillingRule extends Enum
+{
+    public const __DEFAULT = self::ANY;
+    public const ANY = null;
+    public const INVOICE_ONLY = 1;
+    public const NO_INVOICE = 0;
+}
diff --git a/tests/Models/Client.php b/tests/Models/Client.php
index 21d44ed..ccb20f6 100644
--- a/tests/Models/Client.php
+++ b/tests/Models/Client.php
@@ -15,8 +15,21 @@
 namespace Konekt\Enum\Eloquent\Tests\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Konekt\Enum\Eloquent\CastsEnums;
 
+/**
+ * @property int $id
+ * @property BillingRule $billing_rule
+ *
+ * @method static Client create(array $attributes)
+ */
 class Client extends Model
 {
+    use CastsEnums;
+
     protected $guarded = ['id'];
+
+    protected array $enums = [
+        'billing_rule' => BillingRule::class,
+    ];
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 5f7278b..f402397 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -58,6 +58,7 @@ protected function setUpDatabase()
         $this->capsule->schema()->create('clients', function (Blueprint $table) {
             $table->increments('id');
             $table->string('name');
+            $table->integer('billing_rule')->nullable();
             $table->timestamps();
         });