diff --git a/tests/Infra/PackageModels/MyWallet.php b/tests/Infra/PackageModels/MyWallet.php
new file mode 100644
index 000000000..39fd8e33f
--- /dev/null
+++ b/tests/Infra/PackageModels/MyWallet.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bavix\Wallet\Test\Infra\PackageModels;
+
+final class MyWallet extends \Bavix\Wallet\Models\Wallet
+{
+    public function helloWorld(): string
+    {
+        return 'hello world';
+    }
+}
diff --git a/tests/Units/Expand/WalletTest.php b/tests/Units/Expand/WalletTest.php
new file mode 100644
index 000000000..1ff109958
--- /dev/null
+++ b/tests/Units/Expand/WalletTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bavix\Wallet\Test\Units\Expand;
+
+use Bavix\Wallet\Test\Infra\Factories\BuyerFactory;
+use Bavix\Wallet\Test\Infra\Models\Buyer;
+use Bavix\Wallet\Test\Infra\PackageModels\MyWallet;
+use Bavix\Wallet\Test\Infra\TestCase;
+
+/**
+ * @internal
+ */
+final class WalletTest extends TestCase
+{
+    public function testAddMethod(): void
+    {
+        config([
+            'wallet.wallet.model' => MyWallet::class,
+        ]);
+
+        /** @var Buyer $buyer */
+        $buyer = BuyerFactory::new()->create();
+
+        /** @var MyWallet $wallet */
+        $wallet = $buyer->wallet;
+
+        self::assertSame('hello world', $wallet->helloWorld());
+    }
+}