1 files changed, 68 insertions, 0 deletions
diff --git a/js/src/tests/ecma_5/Array/length-set-object.js b/js/src/tests/ecma_5/Array/length-set-object.js
new file mode 100644
index 000000000..bf80b592e
--- /dev/null
+++ b/js/src/tests/ecma_5/Array/length-set-object.js
@@ -0,0 +1,68 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ *   Jeff Walden <jwalden+code@mit.edu>
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 657298;
+var summary = 'Various quirks of setting array length properties to objects';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function invokeConversionTwice1()
+{
+  var count = 0;
+  [].length = { valueOf: function() { count++; return 1; } };
+  assertEq(count, 2);
+}
+invokeConversionTwice1();
+
+function invokeConversionTwice2()
+{
+  var count = 0;
+  [].length = { toString: function() { count++; return 1; }, valueOf: null };
+  assertEq(count, 2);
+}
+invokeConversionTwice2();
+
+function dontOverwriteError1()
+{
+  try
+  {
+    [].length = { valueOf: {}, toString: {} };
+    throw new Error("didn't throw a TypeError");
+  }
+  catch (e)
+  {
+    assertEq(e instanceof TypeError, true,
+             "expected a TypeError running out of conversion options, got " + e);
+  }
+}
+dontOverwriteError1();
+
+function dontOverwriteError2()
+{
+  try
+  {
+    [].length = { valueOf: function() { throw "error"; } };
+    throw new Error("didn't throw a TypeError");
+  }
+  catch (e)
+  {
+    assertEq(e, "error", "expected 'error' from failed conversion, got " + e);
+  }
+}
+dontOverwriteError2();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("All tests passed!");