diff --git a/package.json b/package.json
index 8d356a5..13569bd 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "url": "git+https://github.com/FE-star/exercise4.git"
   },
   "keywords": [
-    "tet"
+    "test"
   ],
   "author": "Daniel Yang",
   "license": "MIT",
diff --git a/test/mocha.opts b/test/mocha.opts
index 0c57d9b..e69de29 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1 +0,0 @@
---require should
\ No newline at end of file
diff --git a/test/test.js b/test/test.js
index 63a72e4..614f1d5 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,10 +1,12 @@
+require('should');
+
 describe('this', function () {
   it('setTimeout', function (done) {
     var obj = {
       say: function () {
         setTimeout(() => {
           // this 是什么？想想为什么？
-          this.should.equal(null)
+          this.should.equal(obj)
           done()
         }, 0)
       }
@@ -15,7 +17,7 @@ describe('this', function () {
   it('global', function () {
     function test() {
       // this 是什么？想想为什么？
-      this.should.equal(null)
+      this.should.equal(global)
     }
     test()
   })
@@ -26,7 +28,7 @@ describe('this', function () {
         say: function () {
           function _say() {
             // this 是什么？想想为什么？
-            this.should.equal(null)
+            this.should.equal(global)
           }
           return _say.bind(obj)
         }()
@@ -39,7 +41,7 @@ describe('this', function () {
       obj.say = function () {
         function _say() {
           // this 是什么？想想为什么？
-          this.should.equal(null)
+          this.should.equal(obj)
         }
         return _say.bind(obj)
       }()