metamask-extension/test/e2e/ganache.js

const { promisify } = require('util');
const ganache = require('ganache-core');

const defaultOptions = {
  blockTime: 2,
  network_id: 1337,
  mnemonic:
    'phrase upgrade clock rough situate wedding elder clever doctor stamp excess tent',
  port: 8545,
  vmErrorsOnRPCResponse: false,
};

class Ganache {
  async start(opts) {
    const options = { ...defaultOptions, ...opts };
    const { port } = options;
    this._server = ganache.server(options);

    const listen = promisify(this._server.listen).bind(this._server);
    const blockchain = await listen(port);

    return {
      ...blockchain,
      port,
    };
  }

  async quit() {
    if (!this._server) {
      throw new Error('Server not running yet');
    }
    const close = promisify(this._server.close).bind(this._server);
    await close();
  }
}

module.exports = Ganache;