Example Test

Code to be tested:

export default function handler(req, res) {
    try {
      if (req.method === 'GET') {
        res.setHeader('Content-Type', 'application/json');
        res.status(200).json({ message: "hello" });
      } else {
        res.setHeader('Allow', ['GET']);
        res.status(405).json({ error: `Method ${req.method} Not Allowed` });
      }
    } catch (error) {
      console.error('Error handling /api/test:', error);
      res.status(500).json({ error: 'Internal Server Error' });
    }
}

Test Code:

import http from 'http';
import handler from './hello';
 
// BASE_URL = process.env.TEST_BASE_URL || 'http://localhost:3000';
const BASE_URL = 'https://fireflies.forgefx.tools/api';
 
describe('GET /api/hello', () => {
  let server;
 
  beforeAll(() => {
    server = http.createServer(handler);
    server.listen(3000);
  });
 
  afterAll((done) => {
    server.close(done);
  });
 
  it('should return 200 with correct message for GET request', async () => {
    const url = `${BASE_URL}/hello`;
    const response = await fetch(url);
    const data = await response.json();
 
    expect(response.status).toBe(200);
    expect(data).toEqual({ message: "hello" });
  });
 
  it('should return 405 for non-GET methods', async () => {
    const response = await fetch(`${BASE_URL}/hello`, { method: 'POST' });
    
    expect(response.status).toBe(405);
    const data = await response.text();
    expect(data).toContain('Method POST Not Allowed');
  });
});