Intial Version

backend/tests/scrapers/scraper-service.test.ts

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+import { ScraperService } from '../../src/scrapers/scraper-service';
+import { VendorListing } from '../../src/scrapers/types';
+
+describe('ScraperService', () => {
+  let service: ScraperService;
+
+  beforeEach(() => {
+    service = new ScraperService();
+  });
+
+  afterEach(async () => {
+    await service.close();
+  });
+
+  describe('calculatePriceIndex', () => {
+    it('should return null for empty listings', () => {
+      const result = service.calculatePriceIndex([]);
+      expect(result).toBeNull();
+    });
+
+    it('should calculate median for odd number of listings', () => {
+      const listings: VendorListing[] = [
+        { pricePerMillion: 10 } as VendorListing,
+        { pricePerMillion: 20 } as VendorListing,
+        { pricePerMillion: 30 } as VendorListing,
+      ];
+      
+      const result = service.calculatePriceIndex(listings);
+      expect(result).toBe(20);
+    });
+
+    it('should calculate median for even number of listings', () => {
+      const listings: VendorListing[] = [
+        { pricePerMillion: 10 } as VendorListing,
+        { pricePerMillion: 20 } as VendorListing,
+        { pricePerMillion: 30 } as VendorListing,
+        { pricePerMillion: 40 } as VendorListing,
+      ];
+      
+      const result = service.calculatePriceIndex(listings);
+      expect(result).toBe(25);
+    });
+
+    it('should handle unsorted listings', () => {
+      const listings: VendorListing[] = [
+        { pricePerMillion: 30 } as VendorListing,
+        { pricePerMillion: 10 } as VendorListing,
+        { pricePerMillion: 20 } as VendorListing,
+      ];
+      
+      const result = service.calculatePriceIndex(listings);
+      expect(result).toBe(20);
+    });
+  });
+});