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

var fs = require('fs')
var assert = require('assert')
var path = require('path')

// sax should be the only dep that ends up installed

var dir = path.resolve(__dirname, 'node_modules')
assert.deepEqual(fs.readdirSync(dir), ['sax'])
assert.equal(require('sax/package.json').version, '0.3.5')