node/test/simple/test-stream2-unpipe-leak.js

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

var util = require('util');

function TestWriter() {
  stream.Writable.call(this);
}
util.inherits(TestWriter, stream.Writable);

TestWriter.prototype._write = function(buffer, encoding, callback) {
  callback(null);
};

var dest = new TestWriter();

function TestReader() {
  stream.Readable.call(this);
}
util.inherits(TestReader, stream.Readable);

TestReader.prototype._read = function(size) {
  this.push(new Buffer('hallo'));
};

var src = new TestReader();

for (var i = 0; i < 10; i++) {
  src.pipe(dest);
  src.unpipe(dest);
}

assert.equal(src.listeners('end').length, 0);
assert.equal(src.listeners('readable').length, 0);

assert.equal(dest.listeners('unpipe').length, 0);
assert.equal(dest.listeners('drain').length, 0);
assert.equal(dest.listeners('error').length, 0);
assert.equal(dest.listeners('close').length, 0);
assert.equal(dest.listeners('finish').length, 0);