add transaction refund client unit test for custom headers

Test/Unit/Gateway/Http/Client/TransactionRefundTest.php

@@ -0,0 +1,98 @@
+<?php
+/**
+ *
+ * Adyen Payment module (https://www.adyen.com/)
+ *
+ * Copyright (c) 2024 Adyen N.V. (https://www.adyen.com/)
+ * See LICENSE.txt for license details.
+ *
+ * Author: Adyen <magento@adyen.com>
+ */
+
+namespace Adyen\Payment\Test\Unit\Gateway\Http\Client;
+
+use Adyen\Client;
+use Adyen\Payment\Gateway\Http\Client\TransactionRefund;
+use Adyen\Payment\Helper\Data;
+use Adyen\Payment\Helper\Idempotency;
+use Adyen\Payment\Test\Unit\AbstractAdyenTestCase;
+use Adyen\Service\Checkout;
+use Magento\Payment\Gateway\Http\TransferInterface;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class TransactionRefundTest extends AbstractAdyenTestCase
+{
+    /**
+     * @var Data|MockObject
+     */
+    private $adyenHelperMock;
+
+    /**
+     * @var Idempotency|MockObject
+     */
+    private $idempotencyHelperMock;
+
+    /**
+     * @var TransactionRefund
+     */
+    private $transactionRefund;
+
+    protected function setUp(): void
+    {
+        $this->adyenHelperMock = $this->createMock(Data::class);
+        $this->idempotencyHelperMock = $this->createMock(Idempotency::class);
+
+        $this->transactionRefund = new TransactionRefund(
+            $this->adyenHelperMock,
+            $this->idempotencyHelperMock
+        );
+    }
+
+    public function testPlaceRequestIncludesHeadersInRequest()
+    {
+        $requestBody = [
+            'amount' => ['value' => 1000, 'currency' => 'EUR'],
+            'paymentPspReference' => '123456789'
+        ];
+
+        $headers = ['idempotencyExtraData' => ['order_id' => '1001']];
+
+        $transferObjectMock = $this->createConfiguredMock(TransferInterface::class, [
+            'getBody' => [$requestBody],
+            'getHeaders' => $headers,
+            'getClientConfig' => []
+        ]);
+
+        $checkoutServiceMock = $this->createMock(Checkout::class);
+        $adyenClientMock = $this->createMock(Client::class);
+
+        $this->adyenHelperMock->method('initializeAdyenClientWithClientConfig')->willReturn($adyenClientMock);
+        $this->adyenHelperMock->method('createAdyenCheckoutService')->willReturn($checkoutServiceMock);
+        $this->adyenHelperMock->method('buildRequestHeaders')->willReturn(['custom-header' => 'value']);
+
+        $this->idempotencyHelperMock->expects($this->once())
+            ->method('generateIdempotencyKey')
+            ->with($requestBody, $headers['idempotencyExtraData'])
+            ->willReturn('generated_idempotency_key');
+
+        $checkoutServiceMock->expects($this->once())
+            ->method('refunds')
+            ->with(
+                $this->equalTo($requestBody),
+                $this->callback(function ($requestOptions) {
+                    $this->assertArrayHasKey('idempotencyKey', $requestOptions);
+                    $this->assertArrayHasKey('headers', $requestOptions);
+                    $this->assertEquals('generated_idempotency_key', $requestOptions['idempotencyKey']);
+                    $this->assertArrayHasKey('custom-header', $requestOptions['headers']);
+                    return true;
+                })
+            )
+            ->willReturn(['pspReference' => 'refund_psp_reference']);
+
+        $responses = $this->transactionRefund->placeRequest($transferObjectMock);
+
+        $this->assertIsArray($responses);
+        $this->assertCount(1, $responses);
+        $this->assertArrayHasKey('pspReference', $responses[0]);
+    }
+}