adopt-a-street/backend/__tests__/setup.js

const { MongoMemoryServer } = require('mongodb-memory-server');
const mongoose = require('mongoose');

let mongoServer;

// Setup before all tests
beforeAll(async () => {
  // Create in-memory MongoDB instance
  mongoServer = await MongoMemoryServer.create();
  const mongoUri = mongoServer.getUri();

  // Set test environment variables
  process.env.JWT_SECRET = 'test-jwt-secret';
  process.env.NODE_ENV = 'test';

  // Connect to in-memory database
  await mongoose.connect(mongoUri, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  });
});

// Cleanup after each test
afterEach(async () => {
  const collections = mongoose.connection.collections;
  for (const key in collections) {
    await collections[key].deleteMany({});
  }
});

// Cleanup after all tests
afterAll(async () => {
  await mongoose.connection.dropDatabase();
  await mongoose.connection.close();
  await mongoServer.stop();
});

// Suppress console logs during tests unless there's an error
global.console = {
  ...console,
  log: jest.fn(),
  debug: jest.fn(),
  info: jest.fn(),
  warn: jest.fn(),
  error: console.error, // Keep error logging
};