node/test/simple/test-dgram-multicast-setTTL.js

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var common = require('../common'),
    assert = require('assert'),
    dgram = require('dgram'),
    thrown = false,
    socket = dgram.createSocket('udp4');

socket.bind(common.PORT);
socket.setMulticastTTL(16);

//Try to set an invalid TTL (valid ttl is > 0 and < 256)
try {
  socket.setMulticastTTL(1000);
} catch (e) {
  thrown = true;
}

assert(thrown, 'Setting an invalid multicast TTL should throw some error');

//close the socket
socket.close();