nodejs/test/simple/test-fs-write-stream.js

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

var path = require('path'),
    fs = require('fs');

var file = path.join(common.tmpDir, 'write.txt');

(function() {
  var stream = fs.WriteStream(file),
      _fs_close = fs.close;

  fs.close = function(fd) {
    assert.ok(fd, 'fs.close must not be called without an undefined fd.');
    fs.close = _fs_close;
  }
  stream.destroy();
})();

(function() {
  var stream = fs.createWriteStream(file);

  stream.addListener('drain', function() {
    assert.fail('\'drain\' event must not be emitted before ' +
                'stream.write() has been called at least once.');
  });
  stream.destroy();
})();