testing routes

src/routes/public.routes.test.tx

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+// src/routes/public.routes.test.ts
+import { describe, it, expect, vi, beforeEach, type Mocked } from 'vitest';
+import supertest from 'supertest';
+import express from 'express';
+import publicRouter from './public'; // Import the router we want to test
+import * as db from '../services/db';
+
+// Mock the entire db service
+vi.mock('../services/db');
+const mockedDb = db as Mocked<typeof db>;
+
+// Mock the logger to keep test output clean
+vi.mock('../services/logger.server', () => ({
+  logger: {
+    info: vi.fn(),
+    debug: vi.fn(),
+    error: vi.fn(),
+    warn: vi.fn(),
+  },
+}));
+
+// Create a minimal Express app to host our router
+const app = express();
+app.use(express.json());
+// Mount the router under a base path, similar to how it's done in the main server
+app.use('/api', publicRouter);
+
+describe('Public Routes (/api)', () => {
+  beforeEach(() => {
+    // Clear all mock history before each test
+    vi.clearAllMocks();
+  });
+
+  describe('GET /health/ping', () => {
+    it('should respond with 200 and "pong"', async () => {
+      const response = await supertest(app).get('/api/health/ping');
+
+      expect(response.status).toBe(200);
+      expect(response.text).toBe('pong');
+    });
+  });
+
+  describe('GET /flyers', () => {
+    it('should return a list of flyers on success', async () => {
+      // Arrange: Mock the database response
+      const mockFlyers = [
+        { flyer_id: 1, store_name: 'Store A' },
+        { flyer_id: 2, store_name: 'Store B' },
+      ];
+      mockedDb.getFlyers.mockResolvedValue(mockFlyers as any);
+
+      // Act: Make the request
+      const response = await supertest(app).get('/api/flyers');
+
+      // Assert
+      expect(response.status).toBe(200);
+      expect(response.body).toEqual(mockFlyers);
+      expect(mockedDb.getFlyers).toHaveBeenCalledTimes(1);
+    });
+
+    it('should handle database errors gracefully', async () => {
+      // Arrange: Mock a database failure
+      mockedDb.getFlyers.mockRejectedValue(new Error('DB Connection Failed'));
+
+      // Act
+      const response = await supertest(app).get('/api/flyers');
+
+      // Assert: The global error handler should catch it and respond with 500
+      expect(response.status).toBe(500);
+    });
+  });
+});
+