1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-9.js b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-9.js
new file mode 100644
index 0000000000..82bc4ff57c
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+++ b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-9.js
@@ -0,0 +1,43 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
+    of O to define the property. Step 7b of [[DefineOwnProperty]] rejects if
+    current.[[Enumerable]] and desc.[[Enumerable]] are the boolean negations
+    of each other.
+es5id: 15.2.3.6-4-9
+description: >
+    Object.defineProperty throws TypeError when changing
+    [[Enumerable]] from true to false on non-configurable data
+    properties
+---*/
+
+var o = {};
+
+// create a data valued property with [[Enumerable]] explicitly set to true;
+// all other attributes default to false.
+var d1 = {
+  value: 101,
+  enumerable: true,
+  configurable: false
+};
+Object.defineProperty(o, "foo", d1);
+
+// now, setting enumerable to false should fail, since [[Configurable]]
+// on the original property will be false.
+var desc = {
+  value: 101,
+  enumerable: false
+};
+assert.throws(TypeError, function() {
+  Object.defineProperty(o, "foo", desc);
+});
+// the property should remain unchanged.
+var d2 = Object.getOwnPropertyDescriptor(o, "foo");
+assert.sameValue(d2.value, 101, 'd2.value');
+assert.sameValue(d2.enumerable, true, 'd2.enumerable');
+assert.sameValue(d2.configurable, false, 'd2.configurable');
+
+reportCompare(0, 0);