internal…

404-parent.js
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			var common = require('../common-tap.js')
			var test = require('tap').test
			var npm = require('../../')
			var osenv = require('osenv')
			var path = require('path')
			var fs = require('fs')
			var rimraf = require('rimraf')
			var mkdirp = require('mkdirp')
			var pkg = path.resolve(__dirname, '404-parent')
			var mr = require('npm-registry-mock')

			test('404-parent: if parent exists, specify parent in error message', function (t) {
			setup()
			rimraf.sync(path.resolve(pkg, 'node_modules'))
			performInstall(function (err) {
			t.ok(err instanceof Error, 'error was returned')
			t.ok(err.parent === '404-parent-test', "error's parent set")
			t.end()
			})
			})

			test('cleanup', function (t) {
			process.chdir(osenv.tmpdir())
			rimraf.sync(pkg)
			t.end()
			})

			function setup () {
			mkdirp.sync(pkg)
			mkdirp.sync(path.resolve(pkg, 'cache'))
			fs.writeFileSync(path.resolve(pkg, 'package.json'), JSON.stringify({
			author: 'Evan Lucas',
			name: '404-parent-test',
			version: '0.0.0',
			description: 'Test for 404-parent',
			dependencies: {
			'test-npm-404-parent-test': '*'
			}
			}), 'utf8')
			process.chdir(pkg)
			}

			function plugin (server) {
			server.get('/test-npm-404-parent-test')
			.reply(404, {'error': 'version not found'})
			}

			function performInstall (cb) {
			mr({port: common.port, plugin: plugin}, function (er, s) { // create mock registry.
			npm.load({registry: common.registry}, function () {
			var pwd = process.cwd()
			process.chdir(pkg)
			npm.commands.install([], function (err) {
			process.chdir(pwd)
			cb(err)
			s.close() // shutdown mock npm server.
			})
			})
			})
			}