How can I use Supertest for testing my Express app?

How can I use Supertest for testing my Express app?

You can use Supertest to test your Express app by making HTTP requests to your endpoints and asserting the responses.

Can you show me a basic example of how to set it up?

Sure! First, install Supertest with npm. Then, you can write a test like this:

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

describe('GET /api', () => {
  it('responds with json', async () => {
    const response = await request(app)
      .get('/api')
      .expect('Content-Type', /json/)
      .expect(200);
  });
});

What are some common assertions I can make with Supertest?

You can assert the status code, response type, response body, and headers. For example, you can check if the response body contains specific data.

Is Supertest compatible with other testing frameworks?

Yes, Supertest works well with popular testing frameworks like Mocha, Jest, and Jasmine.