From 4a6ac52b15f7431e01f6f92a9b03dc2fe36e3b8a Mon Sep 17 00:00:00 2001
From: dacoozheng <23788425@qq.com>
Date: Sun, 3 Jan 2016 19:18:43 +0800
Subject: Test case for #998.

---
 test/test-async.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/test/test-async.js b/test/test-async.js
index 05c0228..19c30c1 100755
--- a/test/test-async.js
+++ b/test/test-async.js
@@ -4309,6 +4309,32 @@ exports['memoize'] = {
         test.equal(val, "bar");
         test.done();
     });
+},
+
+    'avoid constructor key return undefined': function (test) {
+    test.expect(1);
+    var fn = async.memoize(function(name, callback) {
+        async.setImmediate(function(){
+            callback(null, name);
+        });
+    });
+    fn('constructor', function(error, results) {
+        test.equal(results, 'constructor');
+        test.done();
+    });
+},
+
+    'avoid __proto__ key return undefined': function (test) {
+    test.expect(1);
+    var fn = async.memoize(function(name, callback) {
+        async.setImmediate(function(){
+            callback(null, name);
+        });
+    });
+    fn('__proto__', function(error, results) {
+        test.equal(results, '__proto__');
+        test.done();
+    });
 }
 
 };
-- 
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