node/test/simple/test-crypto-hash-stream-pipe.js

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

var crypto = require('crypto');
var stream = require('stream')
var s = new stream.PassThrough();
var h = crypto.createHash('sha1');
var expect = '15987e60950cf22655b9323bc1e281f9c4aff47e';
var gotData = false;

process.on('exit', function() {
  assert(gotData);
  console.log('ok');
});

s.pipe(h).on('data', function(c) {
  assert.equal(c, expect);
  gotData = true;
}).setEncoding('hex');

s.end('aoeu');