Jest-global-setup

gistfile1.txt

const MongodbMemoryServer = require('mongodb-memory-server');
const globalConfigPath = join(__dirname, 'globalConfig.json');

const mongod = new MongodbMemoryServer.default();

module.exports = async () => {
  if (!mongod.isRunning) {
    await mongod.start();
  }

  const mongoConfig = {
    mongoDBName: 'testing-db',
    mongoUri: await mongod.getConnectionString()
  };

  // Write global config to disk because tests might run in different processes and won't have access to env var
  fs.writeFileSync(globalConfigPath, JSON.stringify(mongoConfig));
};