Add update --save/--save-dev tests.

test/tap/update-save.js

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+var common = require("../common-tap.js")
+var test = require("tap").test
+var npm = require("../../")
+var mkdirp = require("mkdirp")
+var rimraf = require("rimraf")
+var fs = require('fs')
+var path = require('path')
+var mr = require("npm-registry-mock")
+
+var PKG_DIR = path.resolve(__dirname, "update-save")
+var PKG = path.resolve(PKG_DIR, "package.json")
+var CACHE_DIR = path.resolve(PKG_DIR, "cache")
+var MODULES_DIR = path.resolve(PKG_DIR, "node_modules")
+
+var EXEC_OPTS = {
+  cwd: PKG_DIR,
+  stdio: 'ignore'
+}
+
+var DEFAULT_PKG = {
+  "name": "update-save-example",
+  "version": "1.2.3",
+  "dependencies": {
+    "mkdirp": "~0.3.0"
+  },
+  "devDependencies": {
+    "underscore": "~1.3.1"
+  }
+}
+
+var s = undefined
+
+test('setup', function (t) {
+  resetPackage()
+
+  mr(common.port, function (server) {
+    npm.load({cache: CACHE_DIR, registry: common.registry}, function (err) {
+      t.ifError(err)
+      s = server
+      t.end()
+    })
+  })
+})
+
+test("update regular dependencies only", function (t) {
+  resetPackage()
+
+  common.npm(['update', '--save'], EXEC_OPTS, function (err, code) {
+    t.ifError(err)
+    t.equal(code, 0)
+    var pkgdata = JSON.parse(fs.readFileSync(PKG, 'utf8'))
+    t.deepEqual(pkgdata.dependencies, {mkdirp: '^0.3.5'}, 'only dependencies updated')
+    t.deepEqual(pkgdata.devDependencies, {underscore: '~1.3.1'}, 'dev dependencies should be untouched')
+    s.close()
+    t.end()
+  })
+})
+
+test("update devDependencies only", function (t) {
+  resetPackage()
+
+  common.npm(['update', '--save-dev'], EXEC_OPTS, function (err, code) {
+    t.ifError(err)
+    t.equal(code, 0)
+    var pkgdata = JSON.parse(fs.readFileSync(PKG, 'utf8'))
+    t.deepEqual(pkgdata.devDependencies, {underscore: '^1.3.3'}, 'dev dependencies should be updated')
+    t.deepEqual(pkgdata.dependencies, {mkdirp: '~0.3.0'}, 'dependencies should be untouched')
+    t.end()
+  })
+})
+
+
+function resetPackage() {
+  rimraf.sync(CACHE_DIR)
+  rimraf.sync(MODULES_DIR)
+  mkdirp.sync(CACHE_DIR)
+
+  fs.writeFileSync(PKG, JSON.stringify(DEFAULT_PKG, null, 2), 'ascii')
+}
+
+test("cleanup", function (t) {
+  resetPackage() // restore package.json
+  rimraf.sync(CACHE_DIR)
+  rimraf.sync(MODULES_DIR)
+  t.end()
+})
+

test/tap/update-save/README.md

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+# just a test

test/tap/update-save/index.js

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+module.exports = true

test/tap/update-save/package.json

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+{
+  "name": "update-save-example",
+  "version": "1.2.3",
+  "dependencies": {
+    "mkdirp": "~0.3.0"
+  },
+  "devDependencies": {
+    "underscore": "~1.3.1"
+  }
+}