1.22.2.4

check-os-reqs.js
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			'use strict'
			var path = require('path')
			var fs = require('fs')
			var test = require('tap').test
			var osenv = require('osenv')
			var mkdirp = require('mkdirp')
			var rimraf = require('rimraf')
			var common = require('../common-tap.js')

			var base = path.join(__dirname, path.basename(__filename, '.js'))
			var installFrom = path.join(base, 'from')
			var installIn = path.join(base, 'in')

			var json = {
			name: 'check-os-reqs',
			version: '0.0.1',
			description: 'fixture',
			os: ['fake-os']
			}

			test('setup', function (t) {
			setup()
			t.end()
			})

			var INSTALL_OPTS = ['--loglevel', 'silly']
			var EXEC_OPTS = {cwd: installIn}

			test('install bad os', function (t) {
			common.npm(['install', installFrom].concat(INSTALL_OPTS), EXEC_OPTS, function (err, code) {
			t.ifError(err, 'npm ran without issue')
			t.is(code, 1, 'npm install refused to install a package in itself')
			t.end()
			})
			})
			test('force install bad os', function (t) {
			common.npm(['install', '--force', installFrom].concat(INSTALL_OPTS), EXEC_OPTS, function (err, code) {
			t.ifError(err, 'npm ran without issue')
			t.is(code, 0, 'npm install happily installed a package in itself with --force')
			t.end()
			})
			})

			test('cleanup', function (t) {
			cleanup()
			t.end()
			})

			function cleanup () {
			process.chdir(osenv.tmpdir())
			rimraf.sync(base)
			}

			function setup () {
			cleanup()
			mkdirp.sync(path.resolve(installFrom, 'node_modules'))
			fs.writeFileSync(
			path.join(installFrom, 'package.json'),
			JSON.stringify(json, null, 2)
			)
			mkdirp.sync(path.resolve(installIn, 'node_modules'))
			process.chdir(base)
			}