implement counting for feed Repository

src/__tests__/ScrapingService.test.ts

@@ -38,5 +38,14 @@ describe('ScrapingService', () => {
       const hasRepository = scrapingService.hasRepository();
       expect(hasRepository).toBe(true);
     });
+
+    test('should get feed count from repository', async () => {
+      mockFeedRepository.count.mockResolvedValue(5);
+      
+      const count = await scrapingService.getFeedCount();
+      
+      expect(mockFeedRepository.count).toHaveBeenCalled();
+      expect(count).toBe(5);
+    });
   });
 });

src/services/ScrapingService.ts

@@ -10,4 +10,8 @@ export class ScrapingService {
   hasRepository(): boolean {
     return this.feedRepository !== null && this.feedRepository !== undefined;
   }
+
+  async getFeedCount(): Promise<number> {
+    return await this.feedRepository.count();
+  }
 }