1 files changed, 110 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/length-truncate-nonconfigurable-sparse.js b/js/src/tests/non262/Array/length-truncate-nonconfigurable-sparse.js
new file mode 100644
index 0000000000..a51fd40898
--- /dev/null
+++ b/js/src/tests/non262/Array/length-truncate-nonconfigurable-sparse.js
@@ -0,0 +1,110 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ *   Jeff Walden <jwalden+code@mit.edu>
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 858381;
+var summary =
+  "Array length redefinition behavior with non-configurable elements";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function addDataProperty(obj, prop, value, enumerable, configurable, writable)
+{
+  var desc =
+    { enumerable: enumerable,
+      configurable: configurable,
+      writable: writable,
+      value: value };
+  Object.defineProperty(obj, prop, desc);
+}
+
+function nonstrict()
+{
+  var arr = [0, , 2, , , 5];
+
+  addDataProperty(arr,  31415926, "foo", true,  true,  true);
+  addDataProperty(arr, 123456789, "bar", true,  true,  false);
+  addDataProperty(arr,   8675309, "qux", false, true,  true);
+  addDataProperty(arr,   1735039, "eit", false, true,  false);
+  addDataProperty(arr, 987654321, "fun", false, true,  false);
+
+  // non-array indexes to spice things up
+  addDataProperty(arr, "foopy", "sdfsd", false, false, false);
+  addDataProperty(arr, 4294967296, "psych", true, false, false);
+  addDataProperty(arr, 4294967295, "psych", true, false, false);
+
+  addDataProperty(arr,  27182818, "eep", false, false, false);
+
+  // Truncate...but only as far as possible.
+  arr.length = 1;
+
+  assertEq(arr.length, 27182819);
+
+  var props = Object.getOwnPropertyNames(arr).sort();
+  var expected =
+    ["0", "2", "5", "1735039", "8675309", "27182818",
+     "foopy", "4294967296", "4294967295", "length"].sort();
+
+  assertEq(props.length, expected.length);
+  for (var i = 0; i < props.length; i++)
+    assertEq(props[i], expected[i], "unexpected property: " + props[i]);
+}
+nonstrict();
+
+function strict()
+{
+  "use strict";
+
+  var arr = [0, , 2, , , 5];
+
+  addDataProperty(arr,  31415926, "foo", true,  true,  true);
+  addDataProperty(arr, 123456789, "bar", true,  true,  false);
+  addDataProperty(arr,   8675309, "qux", false, true,  true);
+  addDataProperty(arr,   1735039, "eit", false, true,  false);
+  addDataProperty(arr, 987654321, "fun", false, true,  false);
+
+  // non-array indexes to spice things up
+  addDataProperty(arr, "foopy", "sdfsd", false, false, false);
+  addDataProperty(arr, 4294967296, "psych", true, false, false);
+  addDataProperty(arr, 4294967295, "psych", true, false, false);
+
+  addDataProperty(arr,  27182818, "eep", false, false, false);
+
+  try
+  {
+    arr.length = 1;
+    throw new Error("didn't throw?!");
+  }
+  catch (e)
+  {
+    assertEq(e instanceof TypeError, true,
+             "non-configurable property should trigger TypeError, got " + e);
+  }
+
+  assertEq(arr.length, 27182819);
+
+  var props = Object.getOwnPropertyNames(arr).sort();
+  var expected =
+    ["0", "2", "5", "1735039", "8675309", "27182818",
+     "foopy", "4294967296", "4294967295", "length"].sort();
+
+  assertEq(props.length, expected.length);
+  for (var i = 0; i < props.length; i++)
+    assertEq(props[i], expected[i], "unexpected property: " + props[i]);
+}
+strict();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");