Add unit test for currency endpoint

tests/Unit/Endpoint/Api/V1/CurrencyEndpointTest.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Endpoint\Api\V1;
+
+use App\Http\Controllers\Api\V1\CurrencyController;
+use App\Service\CurrencyService;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+
+#[CoversClass(CurrencyController::class)]
+#[CoversClass(CurrencyService::class)]
+#[UsesClass(CurrencyController::class)]
+class CurrencyEndpointTest extends ApiEndpointTestAbstract
+{
+    public function test_index_return_list_of_available_currencies_incl_symbol(): void
+    {
+        // Arrange
+
+        // Act
+        $response = $this->getJson(route('api.v1.currencies.index'));
+
+        // Assert
+        $response->assertOk();
+        $response->assertJsonCount(166);
+        $responseObj = collect($response->json());
+        $this->assertSame([
+            'code' => 'EUR',
+            'name' => 'Euro',
+            'symbol' => '€',
+        ], $responseObj->firstWhere('code', '=', 'EUR'));
+    }
+}