Loopback local streams

aka PipedInputStream/PipedOutputStream Mostly useful for testing stuff, as node is kind of single-thread.

var streamA = new LoopbackStream();
var streamB = new LoopbackStream(streamA);
var strs = ['echo', 'direct', 'eof'];
expect(4);
streamA.on('data', function(data){
    data.toString() === strs.shift(); // true
});
streamA.on('end', function(data){
    // done
});
streamB.on('data', function(data){
    this.write(data); // echo
});
streamB.on('end', function(data){
    this.end(); // no more echo
});
streamA.write('echo');
streamB.push('direct');
streamA.end('eof');

see test/ for more usage examples.