add generators tests

package.json

@@ -18,6 +18,7 @@
     "bluebird": "^2.10.1",
     "mz": "^2.0.0",
     "rx": "^4.0.0",
+    "semver": "^5.0.3",
     "simple-get": "^1.4.3",
     "through2": "^2.0.0"
   },

test.js

@@ -10,6 +10,7 @@
 'use strict'
 
 var test = require('assertit')
+var semver = require('semver')
 
 test('errors', function (done) {
   require('./test/errors')
@@ -45,3 +46,10 @@ test('child processes', function (done) {
   require('./test/child_processes')
   done()
 })
+
+if (semver.gte(process.version, '0.11.13')) {
+  test('generators', function (done) {
+    require('./test/generators')
+    done()
+  })
+}

test/generators.js

@@ -0,0 +1,41 @@
+/*!
+ * coone <https://github.com/hybridables/coone>
+ *
+ * Copyright (c) 2015 Charlike Mike Reagent <@tunnckoCore> (http://www.tunnckocore.tk)
+ * Released under the MIT license.
+ */
+
+/* jshint asi:true */
+
+'use strict'
+
+var mzfs = require('mz/fs')
+var test = require('assertit')
+var coone = require('../index')
+
+function * success () {
+  return yield mzfs.readFile('package.json', 'utf8')
+}
+
+function * failure () {
+  return yield mzfs.readFile('foobar.json')
+}
+
+test('should handle successful generator function', function (done) {
+  coone(success)(function (err, res) {
+    test.ifError(err)
+    test.strictEqual(typeof res, 'string')
+    test.ok(res.indexOf('"license": "MIT"') !== -1)
+    done()
+  })
+})
+
+test('should handle generator function errors', function (done) {
+  coone(failure)(function (err, res) {
+    test.ifError(!err)
+    test.ok(err instanceof Error)
+    test.strictEqual(err.code, 'ENOENT')
+    test.strictEqual(res, undefined)
+    done()
+  })
+})