nodejs/test/parallel/test-dgram-bind.js

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'use strict';
const common = require('../common');
const assert = require('assert');
const dgram = require('dgram');

const socket = dgram.createSocket('udp4');

socket.on('listening', common.mustCall(() => {
  common.expectsError(() => {
    socket.bind();
  }, {
    code: 'ERR_SOCKET_ALREADY_BOUND',
    type: Error,
    message: /^Socket is already bound$/
  });

  socket.close();
}));

const result = socket.bind(); // should not throw

assert.strictEqual(result, socket); // should have returned itself