Integration Test Writer

Write integration tests with proper setup/teardown

Write integration tests with proper setup/teardown.

Instructions

1. Integration tests hit real infrastructure (DB, API, filesystem):

import { createTestDatabase, destroyTestDatabase } from './helpers';
import { UserRepository } from '../src/repositories/user';

let db: TestDatabase;
let repo: UserRepository;

beforeAll(async () => {
  db = await createTestDatabase();         // spin up test DB
  repo = new UserRepository(db.connection);
});

afterAll(async () => {
  await destroyTestDatabase(db);           // clean up
});

beforeEach(async () => {
  await db.truncateAll();                  // clean state per test
});

describe('UserRepository', () => {
  it('should save and retrieve user', async () => {
    await repo.create({ name: 'Alice', email: 'alice@test.com' });
    const user = await repo.findByEmail('alice@test.com');

    expect(user).not.toBeNull();
    expect(user!.name).toBe('Alice');
  });

  it('should enforce unique email constraint', async () => {
    await repo.create({ name: 'Alice', email: 'alice@test.com' });
    await expect(
      repo.create({ name: 'Bob', email: 'alice@test.com' })
    ).rejects.toThrow('duplicate');
  });
});

Rules

• Use a separate test database — never test against dev/staging
• Truncate tables between tests, not between suites (isolation)
• Set a timeout: integration tests can be slow
• Run separately from unit tests: npm run test:integration