diff --git a/tests/Library/Economy/Payment/WalletGatewayServiceTest.php b/tests/Library/Economy/Payment/WalletGatewayServiceTest.php
new file mode 100644
index 0000000..5f15a22
--- /dev/null
+++ b/tests/Library/Economy/Payment/WalletGatewayServiceTest.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Tests\Library\Economy\Payment;
+
+use App\Entity\Accounting;
+use App\Entity\AccountingTransaction;
+use App\Entity\Money;
+use App\Entity\Tipjar;
+use App\Entity\User;
+use App\Library\Economy\Payment\WalletGatewayService;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Zenstruck\Foundry\Test\ResetDatabase;
+
+class WalletGatewayServiceTest extends KernelTestCase
+{
+    use ResetDatabase;
+
+    private EntityManagerInterface $entityManager;
+    private WalletGatewayService $walletService;
+
+    public function setUp(): void
+    {
+        self::bootKernel();
+
+        $this->entityManager = static::getContainer()->get(EntityManagerInterface::class);
+        $this->walletService = static::getContainer()->get(WalletGatewayService::class);
+    }
+
+    private function getUserAccounting(): Accounting
+    {
+        $user = new User();
+        $user->setUsername('wallettestuser');
+        $user->setEmail('testuser@wallet.com');
+        $user->setPassword('wallettestpassword');
+
+        $accounting = new Accounting();
+        $accounting->setCurrency('EUR');
+        $accounting->setUser($user);
+
+        $this->entityManager->persist($user);
+        $this->entityManager->flush();
+
+        return $accounting;
+    }
+
+    private function getTipjarAccounting(): Accounting
+    {
+        $tipjar = new Tipjar();
+        $tipjar->setName('WALLET_TEST_TIPJAR');
+
+        $accounting = new Accounting();
+        $accounting->setTipjar($tipjar);
+
+        $this->entityManager->persist($tipjar);
+        $this->entityManager->flush();
+
+        return $accounting;
+    }
+
+    public function testTransactionsAddFunds()
+    {
+        $tipjar = $this->getTipjarAccounting();
+        $user = $this->getUserAccounting();
+
+        $balance = $this->walletService->calcBalance($user);
+
+        $this->assertEquals(0, $balance->amount);
+        $this->assertEquals($user->getCurrency(), $balance->currency);
+
+        $transaction = new AccountingTransaction();
+        $transaction->setMoney(new Money(100, 'EUR'));
+        $transaction->setOrigin($tipjar);
+        $transaction->setTarget($user);
+
+        $this->entityManager->persist($transaction);
+        $this->entityManager->flush();
+
+        $balance = $this->walletService->calcBalance($user);
+
+        $this->assertEquals(100, $balance->amount);
+        $this->assertEquals('EUR', $balance->currency);
+    }
+}