added tests for validation and server error

src/tests/news/getTopHeadlinesController.test.ts → src/tests/news/topHeadlines-mock.test.ts

@@ -1,8 +1,13 @@
+import app from '../../index.js';
+import request from 'supertest';
 import { Request, Response } from 'express';
 import { fetchFromNewsAPI } from '../../utils.js';
 import newsController from '../../modules/News/controller.js';
 
 jest.mock('../../utils.ts');
+jest.mock('../../middleware/auth.ts', () =>
+  jest.fn((req, res, next) => next()),
+);
 
 const mockFetchFromNewsAPI = fetchFromNewsAPI as jest.Mock;
 
@@ -70,4 +75,43 @@ describe('getTopHeadlines controller', () => {
       },
     ]);
   });
+
+  it('should return an empty array if no articles are found', async () => {
+    const mockArticles = { articles: [] };
+
+    mockFetchFromNewsAPI.mockResolvedValue(mockArticles);
+
+    await newsController.getTopHeadlines(req, res);
+
+    expect(mockFetchFromNewsAPI).toHaveBeenCalledWith('/top-headlines', {
+      country: 'de',
+      category: 'business',
+      pageSize: '10',
+    });
+
+    expect(res.status).toHaveBeenCalledWith(200);
+    expect(res.send).toHaveBeenCalledWith([]);
+  });
+
+  it('should return 500 status code if the fetchFromNewsAPI throws an error', async () => {
+    mockFetchFromNewsAPI.mockRejectedValue(new Error());
+
+    await newsController.getTopHeadlines(req, res);
+
+    expect(res.status).toHaveBeenCalledWith(500);
+    expect(res.send).toHaveBeenCalledWith({
+      message: 'Error in getting the top headlines',
+      error: Error(),
+    });
+  });
+
+  it('should return 400 for invalid query parameters', async () => {
+    const res = await request(app).get('/api/news/headlines').query({
+      country: 'bra',
+    });
+    expect(res.status).toBe(400);
+    expect(res.body.error).toContain(
+      '"country" length must be 2 characters long',
+    );
+  });
 });