From b83fa1cf158dc3b287e2b32e9bbdbf3460adf9ff Mon Sep 17 00:00:00 2001
From: Mark Miller <erights@gmail.com>
Date: Tue, 4 Oct 2011 06:52:13 +0200
Subject: Built-in functions should not have non-deletable, non-poisoned
 "caller" and "arguments" properties.

---
 test/suite/bestPractice/Sbp_A10_T1.js | 46 +++++++++++++++++++++++++++++++++++
 test/suite/bestPractice/Sbp_A10_T2.js | 46 +++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 test/suite/bestPractice/Sbp_A10_T1.js
 create mode 100644 test/suite/bestPractice/Sbp_A10_T2.js

diff --git a/test/suite/bestPractice/Sbp_A10_T1.js b/test/suite/bestPractice/Sbp_A10_T1.js
new file mode 100644
index 000000000..76647e724
--- /dev/null
+++ b/test/suite/bestPractice/Sbp_A10_T1.js
@@ -0,0 +1,46 @@
+// Copyright 2011 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @path bestPractice/Sbp_A10_T1.js
+ * @description Built-in functions should not have a non-deletable,
+ * non-poisoned "caller" property.
+ * @bestPractice
+ * http://wiki.ecmascript.org/doku.php?id=conventions:make_non-standard_properties_configurable
+ */
+
+(function() {
+   var map = Array.prototype.map;
+   if (!map) { return; }
+   try {
+     delete map.caller;
+   } catch (err1) {
+     // ignore
+   }
+   if ('caller' in map) {
+     try {
+       Object.defineProperty(map, 'caller', {
+         writable: false,
+         configurable: false
+       });
+     } catch (err2) {
+       // ignore
+     }
+   }
+
+   function foo(m) { return m.caller; }
+   function testfn(a, f) { return a.map(f)[0]; }
+   var a = [map];
+   var caller;
+   try {
+     caller = testfn(a, foo);
+   } catch (err3) {
+     if (err3 instanceof TypeError) { return; }
+     $ERROR('#1: Built-in "caller" failed with: ' + err3);
+   }
+   if (null === caller || void 0 === caller) { return; }
+   if (testfn === caller) {
+     $ERROR('#2: Built-in revealed caller');
+   }
+   $ERROR('#3: Unexpected "caller": ' + caller);
+})();
\ No newline at end of file
diff --git a/test/suite/bestPractice/Sbp_A10_T2.js b/test/suite/bestPractice/Sbp_A10_T2.js
new file mode 100644
index 000000000..6037a5ea3
--- /dev/null
+++ b/test/suite/bestPractice/Sbp_A10_T2.js
@@ -0,0 +1,46 @@
+// Copyright 2011 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @path bestPractice/Sbp_A10_T2.js
+ * @description Built-in functions should not have a non-deletable,
+ * non-poisoned "arguments" property.
+ * @bestPractice
+ * http://wiki.ecmascript.org/doku.php?id=conventions:make_non-standard_properties_configurable
+ */
+
+(function() {
+   var map = Array.prototype.map;
+   if (!map) { return; }
+   try {
+     delete map.arguments;
+   } catch (err1) {
+     // ignore
+   }
+   if ('arguments' in map) {
+     try {
+       Object.defineProperty(map, 'arguments', {
+         writable: false,
+         configurable: false
+       });
+     } catch (err2) {
+       // ignore
+     }
+   }
+
+   function foo(m) { return m.arguments; }
+   function testfn(a, f) { return a.map(f)[0]; }
+   var a = [map];
+   var args;
+   try {
+     args = testfn(a, foo);
+   } catch (err3) {
+     if (err3 instanceof TypeError) { return; }
+     $ERROR('#1: Built-in "arguments" failed with: ' + err3);
+   }
+   if (null === args || void 0 === args) { return; }
+   if (testfn === args) {
+     $ERROR('#2: Built-in revealed arguments');
+   }
+   $ERROR('#3: Unexpected "arguments": ' + args);
+})();
-- 
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