node/test/simple/test-fs-read-stream-fd.js

// Copyright Joyent, Inc. and other Node contributors.
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var fs = require('fs');
var assert = require('assert');
var path = require('path');

var common = require('../common');

var file = path.join(common.tmpDir, '/read_stream_fd_test.txt');
var input = 'hello world';
var output = '';
var fd, stream;

fs.writeFileSync(file, input);
fd = fs.openSync(file, 'r');

stream = fs.createReadStream(null, { fd: fd, encoding: 'utf8' });
stream.on('data', function(data) {
  output += data;
});

process.on('exit', function() {
  fs.unlinkSync(file);
  assert.equal(output, input);
});