add basic tests for reading in the dependencies

Author: addaleax

package.json

@@ -23,6 +23,7 @@
     "validate-npm-package-name": "^2.0.1"
   },
   "devDependencies": {
+    "mkdirp": "^0.5.1",
     "npm": "^2",
     "rimraf": "^2.1.4",
     "tap": "^1.2.0"

test/dependencies.js

@@ -0,0 +1,60 @@
+var tap = require('tap')
+var init = require('../')
+var path = require('path')
+var rimraf = require('rimraf')
+var mkdirp = require('mkdirp')
+var fs = require('fs')
+
+var EXPECT = {
+  name: 'test-deps',
+  version: '1.0.0',
+  description: '',
+  author: '',
+  scripts: { test: 'mocha' },
+  main: 'index.js',
+  keywords: [],
+  license: 'ISC',
+  dependencies: {
+    'tap': '*'
+  },
+  devDependencies: {
+    'mocha': '^1.0.0'
+  }
+}
+
+var origwd = process.cwd()
+var testdir = path.resolve(__dirname, 'test-deps')
+mkdirp.sync(testdir)
+process.chdir(testdir)
+
+fs.writeFileSync(path.resolve(testdir, 'package.json'), JSON.stringify({
+  dependencies: {
+    'tap': '*'
+  }
+}))
+
+var fakedeps = ['mocha', 'tap', 'async', 'foobar']
+
+fakedeps.forEach(function(dep) {
+  var depdir = path.resolve(testdir, 'node_modules', dep)
+  mkdirp.sync(depdir)
+
+  fs.writeFileSync(path.resolve(depdir, 'package.json'), JSON.stringify({
+    name: dep,
+    version: '1.0.0'
+  }))
+})
+
+tap.test('read in dependencies and dev deps', function (t) {
+  init(testdir, testdir, {yes: 'yes', 'save-prefix': '^'}, function (er, data) {
+    if (er) throw er
+
+    t.has(data, EXPECT, 'used the correct dependency information')
+    t.end()
+  })
+})
+
+tap.test('teardown', function (t) {
+  process.chdir(origwd)
+  rimraf(testdir, t.end.bind(t))
+})