/typescript-e2e-testing

MongoDB E2E Testing Knowledge

Overview

MongoDB E2E testing focuses on verifying document-based data persistence, schema validation, and query behaviors in a NoSQL context.

Key Concepts

MongoDB vs PostgreSQL for Testing

Test Isolation Strategies

Mongoose vs Native Driver

Docker Configuration for Tests

mongodb-e2e:
  image: mongo:7.0
  ports:
    - "27018:27017"  # Different from dev
  environment:
    MONGO_INITDB_ROOT_USERNAME: test
    MONGO_INITDB_ROOT_PASSWORD: test
    MONGO_INITDB_DATABASE: testdb
  command: mongod --wiredTigerCacheSizeGB 1

MongoDB Memory Server

For CI/CD environments without Docker or for faster local testing:

import { MongoMemoryServer } from 'mongodb-memory-server';

let mongod: MongoMemoryServer;

export async function setupMongoMemoryServer(): Promise<string> {
  mongod = await MongoMemoryServer.create({
    instance: { dbName: 'testdb', storageEngine: 'wiredTiger' },
  });
  return mongod.getUri();
}

export async function teardownMongoMemoryServer(): Promise<void> {
  if (mongod) await mongod.stop();
}

Key Files