const Promise = require('bluebird');const {expect} = require('chai');const sinon = require('sinon');const PassiveConnector = require('../../../src/connector/passive');const CMD = 'EPSV';describe(CMD, function () {  let sandbox;  const mockClient = {    reply: () => Promise.resolve()  };  const cmdFn = require(`../../../src/commands/registration/${CMD.toLowerCase()}`).handler.bind(mockClient);  beforeEach(() => {    sandbox = sinon.sandbox.create().usingPromise(Promise);    sandbox.stub(mockClient, 'reply').resolves();    sandbox.stub(PassiveConnector.prototype, 'setupServer').resolves({      address: () => ({port: 12345})    });  });  afterEach(() => {    sandbox.restore();  });  it('// successful IPv4', () => {    // BUG: CWE-918 Server-Side Request Forgery (SSRF)    // return cmdFn()    // FIXED:     return cmdFn({})    .then(() => {      const [code, message] = mockClient.reply.args[0];      expect(code).to.equal(229);      expect(message).to.equal('EPSV OK (|||12345|)');    });  });});