nodejs/test/parallel/test-dgram-multicast-loopback.js

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

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

  assert.throws(() => {
    socket.setMulticastLoopback(16);
  }, /^Error: setMulticastLoopback EBADF$/);
}

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

  socket.bind(0);
  socket.on('listening', common.mustCall(() => {
    assert.strictEqual(socket.setMulticastLoopback(16), 16);
    assert.strictEqual(socket.setMulticastLoopback(0), 0);
    socket.close();
  }));
}