How do I unit test my Express routes?

How do I unit test my Express routes?

To unit test your Express routes, you can use testing frameworks like Mocha or Jest along with Supertest.

Can you show me a simple example?

Sure! Here's a basic example using Jest and Supertest:

const request = require('supertest');
const app = require('./app'); // Your Express app

describe('GET /api/users', () => {
  it('should return a list of users', async () => {
    const response = await request(app).get('/api/users');
    expect(response.statusCode).toBe(200);
    expect(response.body).toBeInstanceOf(Array);
  });
});

What if I want to test a route with parameters?

You can test routes with parameters by passing them in the URL. For example:

describe('GET /api/users/:id', () => {
  it('should return a user by ID', async () => {
    const response = await request(app).get('/api/users/1');
    expect(response.statusCode).toBe(200);
    expect(response.body).toHaveProperty('id', 1);
  });
});