--- /dev/null
+var fs = require('graceful-fs')
+var path = require('path')
+var existsSync = fs.existsSync || path.existsSync
+
+var mkdirp = require('mkdirp')
+var mr = require('npm-registry-mock')
+var rimraf = require('rimraf')
+var test = require('tap').test
+
+var common = require('../common-tap.js')
+var server
+
+var pkg = path.join(__dirname, 'dedupe')
+
+var EXEC_OPTS = { cwd: pkg }
+
+var json = {
+ author: 'Dedupe tester',
+ name: 'dedupe',
+ version: '0.0.0',
+ dependencies: {
+ optimist: '0.6.0',
+ clean: '2.1.6'
+ }
+}
+
+test('setup', function (t) {
+ t.comment('test for https://github.com/npm/npm/issues/4675')
+ setup(function () {
+ t.end()
+ })
+})
+
+test('dedupe finds the common module and moves it up one level', function (t) {
+ common.npm(
+ [
+ '--registry', common.registry,
+ 'install', '.'
+ ],
+ EXEC_OPTS,
+ function (err, code) {
+ t.ifError(err, 'successfully installed directory')
+ t.equal(code, 0, 'npm install exited with code')
+ common.npm(
+ [
+ 'dedupe'
+ ],
+ EXEC_OPTS,
+ function (err, code) {
+ t.ifError(err, 'successfully deduped against previous install')
+ t.notOk(code, 'npm dedupe exited with code')
+
+ t.ok(existsSync(path.join(pkg, 'node_modules', 'minimist')))
+ t.notOk(existsSync(path.join(pkg, 'node_modules', 'checker')))
+
+ t.end()
+ }
+ )
+ })
+})
+
+test('cleanup', function (t) {
+ server.close()
+ cleanup()
+
+ t.end()
+})
+
+function cleanup () {
+ rimraf.sync(pkg)
+}
+
+function setup (cb) {
+ cleanup()
+ mkdirp.sync(path.join(pkg, 'node_modules'))
+ fs.writeFileSync(
+ path.join(pkg, 'package.json'),
+ JSON.stringify(json, null, 2)
+ )
+ process.chdir(pkg)
+
+ mr({ port: common.port }, function (er, s) {
+ server = s
+ cb()
+ })
+}