feat: implement currency exchange rate scraping service and command

tests/Feature/Services/CurrencyServiceFeatureTest.php

@@ -0,0 +1,80 @@
+<?php
+
+namespace Tests\Feature\Services;
+
+use App\Services\CurrencyService;
+use Carbon\Carbon;
+use Illuminate\Contracts\Container\BindingResolutionException;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\File;
+use Symfony\Component\DomCrawler\Crawler;
+use Tests\TestCase;
+
+/**
+ * @group real test - requires internet connection and maybe slow
+ */
+class CurrencyServiceFeatureTest extends TestCase
+{
+    protected $currencyService;
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->currencyService = new CurrencyService();
+    }
+
+    /**
+     * Test getting last twenty days of currency data
+     */
+    public function testGetLastTwentyDays()
+    {
+        $result = $this->currencyService->getLastTwentyDays();
+
+        $this->assertIsArray($result);
+        $this->assertNotEmpty($result);
+
+        $firstItem = $result[0];
+        $this->assertArrayHasKey('currency', $firstItem);
+        $this->assertArrayHasKey('city', $firstItem);
+        $this->assertArrayHasKey('price_buy', $firstItem);
+        $this->assertArrayHasKey('price_sell', $firstItem);
+        $this->assertArrayHasKey('date', $firstItem);
+        $this->assertArrayHasKey('day', $firstItem);
+
+        $this->assertContains('Sanaa', array_column($result, 'city'));
+        $this->assertContains('Aden', array_column($result, 'city'));
+
+        $this->assertContains('USD', array_column($result, 'currency'));
+        $this->assertContains('SAR', array_column($result, 'currency'));
+    }
+
+    /**
+     * Test getting today's currencies
+     */
+    public function testGetTodayCurrencies()
+    {
+        $result = $this->currencyService->getTodayCurrencies();
+
+        // Assertions
+        $this->assertIsArray($result);
+        $this->assertNotEmpty($result);
+
+        // Should only return today's data for Sanaa and Aden
+        // In our sample, there are 4 entries for today (2 cities x 2 currencies)
+        $todayDate = Carbon::today()->format('Y-m-d');
+        $todayItems = array_filter($result, function ($item) use ($todayDate) {
+            return $item['date'] === $todayDate;
+        });
+
+
+        // Check that we have both cities
+        $cities = array_column($todayItems, 'city');
+        $this->assertContains('Sanaa', $cities);
+        $this->assertContains('Aden', $cities);
+
+        // Check that we have both currencies
+        $currencies = array_column($todayItems, 'currency');
+        $this->assertContains('USD', $currencies);
+        $this->assertContains('SAR', $currencies);
+    }
+}