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-rw-r--r--js/src/tests/non262/Symbol/property-nonwritable.js31
1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/non262/Symbol/property-nonwritable.js b/js/src/tests/non262/Symbol/property-nonwritable.js
new file mode 100644
index 0000000000..3e58383c78
--- /dev/null
+++ b/js/src/tests/non262/Symbol/property-nonwritable.js
@@ -0,0 +1,31 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+var sym = Symbol.for("moon");
+function checkNotWritable(obj) {
+ // In sloppy mode, assigning to a nonwritable property silently fails.
+ obj[sym] = "portals";
+ assertEq(obj[sym], "cheese");
+
+ // In strict mode code, it throws.
+ assertThrowsInstanceOf(function () { "use strict"; obj[sym] = "robots"; }, TypeError);
+ assertEq(obj[sym], "cheese");
+}
+
+var x = {};
+Object.defineProperty(x, sym, {
+ configurable: true,
+ enumerable: true,
+ value: "cheese",
+ writable: false
+});
+
+checkNotWritable(x);
+
+// Assignment can't shadow inherited nonwritable properties either.
+var y = Object.create(x);
+checkNotWritable(y);
+checkNotWritable(Object.create(y));
+
+if (typeof reportCompare === "function")
+ reportCompare(0, 0);