node/deps/npm/test/packages/npm-test-shrinkwrap/test.js

var assert = require('assert')

process.env.npm_config_prefix = process.cwd()
delete process.env.npm_config_global
delete process.env.npm_config_depth

var npm = process.env.npm_execpath

require('child_process').execFile(process.execPath, [npm, 'ls', '--json'],
  { stdio: 'pipe', env: process.env, cwd: process.cwd() },
  function (err, stdout, stderr) {
    if (err) throw err

    var actual = JSON.parse(stdout)
    var expected = require('./npm-shrinkwrap.json')
    rmFrom(actual)
    actual = actual.dependencies
    rmFrom(expected)
    expected = expected.dependencies
    console.error(JSON.stringify(actual, null, 2))
    console.error(JSON.stringify(expected, null, 2))

    assert.deepEqual(actual, expected)
  }
)

function rmFrom (obj) {
  for (var i in obj) {
    if (i === 'from') {
      delete obj[i]
    } else if (i === 'dependencies') {
      for (var j in obj[i]) {
        rmFrom(obj[i][j])
      }
    }
  }
}