update tests

index.js

@@ -19,6 +19,9 @@ var NativePromise = require('native-promise')
  * const fs = require('fs')
  * const getPromise = require('native-or-another')
  * const NativeOrBluebird = getPromise()
+ * // => `bluebird` promise, but only if installed,
+ * // throws otherwise
+ *
  * const NativeOrPromise = getPromise(require('promise'))
  * const NativeOrPinkie = getPromise(require('pinkie'))
  * const NativeOrQ = getPromise(require('q'))
@@ -42,7 +45,10 @@ var NativePromise = require('native-promise')
  * @api public
  */
 module.exports = function nativeOrAnother (Promize) {
-  if (NativePromise) return NativePromise
+  if (NativePromise) {
+    NativePromise.___nativePromise = true
+    return NativePromise
+  }
   if (typeof Promize === 'function') {
     Promize.___customPromise = true
     return Promize
@@ -55,10 +61,8 @@ module.exports = function nativeOrAnother (Promize) {
     console.error('Please install `bluebird` yourself (as devDependency is enough)')
     console.error('or give Promise implementation.')
     console.error('See the https://github.com/tunnckoCore/native-or-another for more info.')
-    process.exit(1)
     throw err
   }
-
   Promize.___bluebirdPromise = true
   return Promize
 }

package.json

@@ -14,9 +14,10 @@
   },
   "devDependencies": {
     "assertit": "^0.1.0",
-    "bluebird": "^3.4.2",
+    "cross-spawn": "^4.0.0",
     "pinkie": "^2.0.1",
-    "semver": "^5.0.3"
+    "semver": "^5.0.3",
+    "spawn-sync": "^1.0.15"
   },
   "files": [
     "index.js"

test.js

@@ -12,31 +12,53 @@
 var test = require('assertit')
 var semver = require('semver')
 var getPromise = require('./index')
+var spawnSync = require('cross-spawn').sync
+
+test('should throw err if no `Promise` given and if no `bluebird` installed', function (done) {
+  function fixture () {
+    return getPromise()
+  }
+
+  if (semver.lt(process.version, '0.11.13')) {
+    test.throws(fixture, Error)
+    test.throws(fixture, /Cannot find module 'bluebird'/)
+    return done()
+  }
+
+  test.strictEqual(fixture().___nativePromise, true)
+  done()
+})
 
 test('should use native Promise if available, Bluebird if installed', function (done) {
+  var res = spawnSync('npm', ['install', '-D', 'bluebird'])
+  /* istanbul ignore next */
+  if (res.error) return done(err)
+
   var Promize = getPromise()
   var promise = new Promize(function (resolve, reject) {
     resolve(123)
   })
 
-  promise.then(function (res) {
+  return promise.then(function (res) {
     test.strictEqual(res, 123)
     if (semver.lt(process.version, '0.11.13')) {
       test.strictEqual(Promize.___bluebirdPromise, true)
     }
-    done()
+    var proc = spawnSync('npm', ['uninstall', '-D', 'bluebird'])
+    done(proc.error)
   }, done)
 })
 
 test('should use given custom promise module', function (done) {
   var Promize = getPromise(require('pinkie'))
   var promise = Promize.resolve(456)
 
-  promise.then(function (res) {
+  return promise.then(function (res) {
     test.strictEqual(res, 456)
     if (semver.lt(process.version, '0.11.13')) {
       test.strictEqual(Promize.___customPromise, true)
     }
     done()
   }, done)
 })
+