test/parallel/test-tcp-wrap.js

// Flags: --expose-internals
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'use strict';
require('../common');
const assert = require('assert');

const { internalBinding } = require('internal/test/binding');
const { TCP, constants: TCPConstants } = internalBinding('tcp_wrap');
const { UV_EINVAL } = internalBinding('uv');

const handle = new TCP(TCPConstants.SOCKET);

// Should be able to bind to the port
let err = handle.bind('0.0.0.0', 0);
assert.strictEqual(err, 0);

// Should not be able to bind to the same port again
const out = {};
handle.getsockname(out);
err = handle.bind('0.0.0.0', out.port);
assert.strictEqual(err, UV_EINVAL);

handle.close();