nodejs-postgresql-testcontainers

An example project showcasing how to use @trendyol/jest-testcontainers to write integration tests for your PostgreSQL queries.

Read the article describing this project in detail on Medium.

Project Structure

.
├── migrations        # database migratioons
├── src               # source code of your application
└── test
    ├── integration   # integration tests that contain IO operations(e.g. DB, Queue)
    └── unit          # unit tests for pure business logic / interaction witout IO

Overview

1. test/integration/ includes various files like jest.config.js, jest-testcontainers-config.js and preset.js for configuring jest-testcontainers to start a PostgreSQL instance.
2. jest-testcontainers is used to start a PostgreSQL instance and wait for t to start.
3. migrations/ folder stores database schema migrations that will be applied to the started PostgreSQL instance.
4. postgresql.environment.ts uses node-pg-migrate to migrate PostgreSQL instance started by the jest-testcontainers.
5. test/integration/ folder is scanned for files with *.test.ts prefix and tests are ran.

Watch mode is supported so you can start your integration tests in watch mode and refactor your code whilst your PostgreSQL Docker instance is up.