jest/examples/mongodb/mongo-environment.js

// mongo-environment.js
const NodeEnvironment = require('jest-environment-node');

const path = require('path');

const fs = require('fs');

const globalConfigPath = path.join(__dirname, 'globalConfig.json');

class MongoEnvironment extends NodeEnvironment {
  constructor(config) {
    super(config);
  }

  async setup() {
    console.log('Setup MongoDB Test Environment');

    const globalConfig = JSON.parse(fs.readFileSync(globalConfigPath, 'utf-8'));

    this.global.__MONGO_URI__ = globalConfig.mongoUri;
    this.global.__MONGO_DB_NAME__ = globalConfig.mongoDBName;

    await super.setup();
  }

  async teardown() {
    console.log('Teardown MongoDB Test Environment');

    await super.teardown();
  }

  getVmContext() {
    return super.getVmContext();
  }
}

module.exports = MongoEnvironment;