text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  const common = require('../common');
  const assert = require('assert');
  const dgram = require('dgram');
  
  {
    // IPv4 Test
    const socket = dgram.createSocket('udp4');
  
    socket.on('listening', common.mustCall(() => {
      const address = socket.address();
  
      assert.strictEqual(address.address, common.localhostIPv4);
      assert.strictEqual(typeof address.port, 'number');
      assert.ok(isFinite(address.port));
      assert.ok(address.port > 0);
      assert.strictEqual(address.family, 'IPv4');
      socket.close();
    }));
  
    socket.on('error', (err) => {
      socket.close();
      assert.fail(`Unexpected error on udp4 socket. ${err.toString()}`);
    });
  
    socket.bind(0, common.localhostIPv4);
  }
  
  if (common.hasIPv6) {
    // IPv6 Test
    const socket = dgram.createSocket('udp6');
    const localhost = '::1';
  
    socket.on('listening', common.mustCall(() => {
      const address = socket.address();
  
      assert.strictEqual(address.address, localhost);
      assert.strictEqual(typeof address.port, 'number');
      assert.ok(isFinite(address.port));
      assert.ok(address.port > 0);
      assert.strictEqual(address.family, 'IPv6');
      socket.close();
    }));
  
    socket.on('error', (err) => {
      socket.close();
      assert.fail(`Unexpected error on udp6 socket. ${err.toString()}`);
    });
  
    socket.bind(0, localhost);
  }
  
  {
    // Verify that address() throws if the socket is not bound.
    const socket = dgram.createSocket('udp4');
  
    assert.throws(() => {
      socket.address();
    }, /^Error: getsockname EBADF$/);
  }
  