internal…

install-local-dep-cycle.js
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			'use strict'
			var path = require('path')
			var fs = require('graceful-fs')
			var mkdirp = require('mkdirp')
			var rimraf = require('rimraf')
			var test = require('tap').test
			var common = require('../common-tap.js')

			var base = path.join(__dirname, path.basename(__filename, '.js'))

			var baseJSON = {
			name: 'base',
			version: '1.0.0',
			dependencies: {
			a: 'file:a/',
			b: 'file:b/'
			}
			}

			var aPath = path.join(base, 'a')
			var aJSON = {
			name: 'a',
			version: '1.0.0',
			dependencies: {
			b: 'file:../b',
			c: 'file:../c'
			}
			}

			var bPath = path.join(base, 'b')
			var bJSON = {
			name: 'b',
			version: '1.0.0'
			}

			var cPath = path.join(base, 'c')
			var cJSON = {
			name: 'c',
			version: '1.0.0',
			dependencies: {
			b: 'file:../b'
			}
			}

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

			test('install', function (t) {
			common.npm(['install'], {cwd: base}, function (er, code, stdout, stderr) {
			t.ifError(er, 'npm config ran without issue')
			t.is(code, 0, 'exited with a non-error code')
			t.is(stderr, '', 'Ran without errors')
			t.end()
			})
			})

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

			function saveJson (pkgPath, json) {
			mkdirp.sync(pkgPath)
			fs.writeFileSync(path.join(pkgPath, 'package.json'), JSON.stringify(json, null, 2))
			}

			function setup () {
			saveJson(base, baseJSON)
			saveJson(aPath, aJSON)
			saveJson(bPath, bJSON)
			saveJson(cPath, cJSON)
			}

			function cleanup () {
			rimraf.sync(base)
			}