internal…

git-cache-locking.js
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			var test = require('tap').test
			var common = require('../common-tap')
			var path = require('path')
			var rimraf = require('rimraf')
			var mkdirp = require('mkdirp')
			var pkg = path.resolve(__dirname, 'git-cache-locking')
			var tmp = path.join(pkg, 'tmp')
			var cache = path.join(pkg, 'cache')
			var shallowClone = Object.assign \|\| require('util')._extend

			test('setup', function (t) {
			rimraf.sync(pkg)
			mkdirp.sync(path.resolve(pkg, 'node_modules'))
			t.end()
			})

			test('git-cache-locking: install a git dependency', function (t) {
			// disable git integration tests on Travis.
			if (process.env.TRAVIS) return t.end()

			var gitEnv = shallowClone({}, process.env)
			gitEnv.npm_config_cache = cache
			gitEnv.npm_config_tmp = tmp
			gitEnv.npm_config_prefix = pkg
			gitEnv.npm_config_global = 'false'

			// package c depends on a.git#master and b.git#master
			// package b depends on a.git#master
			common.npm([
			'install',
			'git://github.com/nigelzor/npm-4503-c.git'
			], {
			cwd: pkg,
			env: gitEnv
			}, function (err, code, stdout, stderr) {
			if (err) throw err
			t.equal(0, code, 'npm install should succeed')
			t.end()
			})
			})

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