Check is test notification

src/Model/Objects/NotificationBody/BasicPayment.php

@@ -151,4 +151,10 @@ public function getNotificationAssociative()
 
         return $notification;
     }
+
+    /** @return bool */
+    public function isTestNotification()
+    {
+        return 1 === preg_match('/^TR-[A-Z0-9]+-TST[0-9]+X$/', $this->tr_id->getValue());
+    }
 }

tests/Model/Objects/NotificationBody/BasicPaymentTest.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Tpay\Tests\OpenApi\Model\Objects\NotificationBody;
+
+use PHPUnit\Framework\TestCase;
+use Tpay\OpenApi\Model\Objects\NotificationBody\BasicPayment;
+
+class BasicPaymentTest extends TestCase
+{
+    /**
+     * @dataProvider validTestNotificationProvider
+     *
+     * @param mixed $transactionId
+     */
+    public function testIsTestNotificationReturnsTrue($transactionId)
+    {
+        $payment = new BasicPayment();
+        $payment->setObjectValues($payment, [
+            'tr_id' => $transactionId,
+        ]);
+
+        $this->assertTrue($payment->isTestNotification());
+    }
+
+    /**
+     * @dataProvider invalidTestNotificationProvider
+     *
+     * @param mixed $transactionId
+     */
+    public function testIsTestNotificationReturnsFalse($transactionId)
+    {
+        $payment = new BasicPayment();
+        $payment->setObjectValues($payment, [
+            'tr_id' => $transactionId,
+        ]);
+
+        $this->assertFalse($payment->isTestNotification());
+    }
+
+    public static function validTestNotificationProvider()
+    {
+        return [
+            ['TR-123-TST456X'],
+            ['TR-ABC-TST999X'],
+            ['TR-123ABC-TST456X'],
+        ];
+    }
+
+    public static function invalidTestNotificationProvider()
+    {
+        return [
+            'empty first part' => ['TR--TST456X'],
+            'empty second part' => ['TR-123-TSTX'],
+            'missing final X' => ['TR-123-TST456'],
+            'wrong prefix' => ['XX-123-TST456X'],
+            'missing TST' => ['TR-123-ABC456X'],
+            'extra chars after X' => ['TR-123-TST45X6'],
+            'first part contains dash' => ['TR-12-3-TST456X'],
+        ];
+    }
+}