From 388b986a98910d40506e4d1c0cb0a56eefe998ce Mon Sep 17 00:00:00 2001
From: Jeff Walden <jwalden@mit.edu>
Date: Wed, 22 Dec 2010 21:32:02 -0500
Subject: [PATCH] Add tests for bug 600392, which was fixed by a backout in bug
 599159.  r=testingonlychange

---
 js/src/tests/ecma_5/Array/jstests.list |  7 +--
 js/src/tests/ecma_5/Array/length-01.js | 71 ++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 3 deletions(-)
 create mode 100644 js/src/tests/ecma_5/Array/length-01.js

diff --git a/js/src/tests/ecma_5/Array/jstests.list b/js/src/tests/ecma_5/Array/jstests.list
index 402074b74f90..78f1b627dde8 100644
--- a/js/src/tests/ecma_5/Array/jstests.list
+++ b/js/src/tests/ecma_5/Array/jstests.list
@@ -1,6 +1,7 @@
 url-prefix ../../jsreftest.html?test=ecma_5/Array/
-script sort-01.js
-script toString-01.js
-script toLocaleString-01.js
+script length-01.js
 script regress-599159.js
+script sort-01.js
+script toLocaleString-01.js
+script toString-01.js
 script unshift-01.js
diff --git a/js/src/tests/ecma_5/Array/length-01.js b/js/src/tests/ecma_5/Array/length-01.js
new file mode 100644
index 000000000000..4fe81e2b6eef
--- /dev/null
+++ b/js/src/tests/ecma_5/Array/length-01.js
@@ -0,0 +1,71 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ *   Jeff Walden <jwalden+code@mit.edu>
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 600392;
+var summary =
+  'Object.preventExtensions([]).length = 0 should do nothing, not throw';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+
+function testEmpty()
+{
+  var a = [];
+  assertEq(a.length, 0);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 0);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testEmpty();
+
+function testEmptyStrict()
+{
+  "use strict";
+  var a = [];
+  assertEq(a.length, 0);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 0);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testEmptyStrict();
+
+function testNonEmpty()
+{
+  var a = [1, 2, 3];
+  assertEq(a.length, 3);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 3);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testNonEmpty();
+
+function testNonEmptyStrict()
+{
+  "use strict";
+  var a = [1, 2, 3];
+  assertEq(a.length, 3);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 3);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testNonEmptyStrict();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("All tests passed!");