node_modules/npm/test/tap/build-already-built.js

// if "npm rebuild" is run with bundled dependencies,
// message "already built" should not be error
var test = require("tap").test
var path = require("path")
var osenv = require("osenv")
var rimraf = require("rimraf")
var npmlog = require("npmlog")
var mkdirp = require("mkdirp")
var requireInject = require("require-inject")

var npm = require("../../lib/npm.js")

var PKG_DIR = path.resolve(__dirname, "build-already-built")
var fakePkg = "foo"

test("setup", function (t) {
  cleanup()

  t.end()
})

test("issue #6735 build 'already built' message", function (t) {
  npm.load({loglevel : "warn"}, function () {
    // capture log messages with level
    var log = ""
    npmlog.on("log", function (chunk) {
      log += chunk.level + " " + chunk.message + "\n"
    })

    mkdirp.sync(fakePkg)
    var folder = path.resolve(fakePkg)

    var global = npm.config.get("global")

    var build = requireInject("../../lib/build", {
    })

    t.test("pin previous behavior", function (t) {

      build([fakePkg], global, false, false, function (err) {
        t.ok(err, "build failed as expected")
        t.similar(err.message, /package.json/, "missing package.json as expected")
        t.notSimilar(log, /already built/, "no already built message written")

        t.end()
      })
    })

    t.test("simulate rebuild of bundledDependency", function (t) {

      log = ""

      build._didBuild[folder] = true

      build([fakePkg], global, false, false, function (err) {
        t.ok(err, "build failed as expected")
        t.similar(err.message, /package.json/, "missing package.json as expected")

        t.similar(log, /already built/, "already built message written")
        t.notSimilar(log, /ERR! already built/, "already built message written is not error")
        t.similar(log, /info already built/, "already built message written is info")

        t.end()
      })
    })

    t.end()
  })
})


test("cleanup", function (t) {
  cleanup()

  t.end()
})

function cleanup () {
  process.chdir(osenv.tmpdir())
  rimraf.sync(PKG_DIR)
}