ts-jest preset

node test environment

roots in src

testMatch pattern

coverageThreshold at 80

setupFilesAfterEnv

beforeEach DB reset

afterEach DB rollback

afterAll connection close

env.test file

directory structure

test script

test:coverage script

test:ci script

Mock external API

Mock email service

Fake timers for expiry

AAA structure

Clear test names

Test isolation — beforeEach reset

Edge case coverage

No hardcoded secrets

Mock cleared after time test

Isolation from real DB

Mock called assertions

In-memory SQLite

Dependency injection override

Override cleared after tests

Success status code 201

Failure status code 4xx

Response body structure check

DB state verification

401 without token

200 with valid token

Role-based 403

Error message validation

Async test functions

Function-scoped fixtures