easyBackend

What is the difference between unit, integration, and end-to-end tests for a Node.js API?

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01

Understand the problem

The testing pyramid applied to a backend service.

nodejstestingintegratione2e
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

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03

Study the solution

The solution is waiting

Give it an honest attempt first — then compare your thinking with the full walkthrough.

04

Read the code

Integration test of a route with supertest
import request from 'supertest';
import { test } from 'node:test';
import assert from 'node:assert/strict';
import { app } from '../app.js';      // real app + test DB

test('POST /users creates a user', async () => {
  const res = await request(app).post('/users').send({ email: 'a@b.com' });
  assert.equal(res.status, 201);
  assert.ok(res.body.id);
});
05

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