1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-16.js b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-16.js
new file mode 100644
index 0000000000..a6bc962c84
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+++ b/js/src/tests/test262/built-ins/Object/defineProperty/15.2.3.6-4-16.js
@@ -0,0 +1,39 @@
+// 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. For non-configurable properties, step 10.a.i
+    of [[DefineOwnProperty]] rejects if relaxing the [[Writable]] attribute.
+es5id: 15.2.3.6-4-16
+description: >
+    Object.defineProperty throws TypeError when relaxing [[Writable]]
+    on non-configurable data properties
+---*/
+
+var o = {};
+
+// create a data valued property; all other attributes default to false.
+var d1 = {
+  value: 101
+};
+Object.defineProperty(o, "foo", d1);
+
+// now, relaxing [[Writable]] on "foo" should fail, since both
+// [[Configurable]] and [[Writable]] on the original property will be false.
+var desc = {
+  value: 101,
+  writable: true
+};
+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.writable, false, 'd2.writable');
+assert.sameValue(d2.enumerable, false, 'd2.enumerable');
+assert.sameValue(d2.configurable, false, 'd2.configurable');
+
+reportCompare(0, 0);