1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/non262/RegExp/lastIndex-nonwritable.js b/js/src/tests/non262/RegExp/lastIndex-nonwritable.js
new file mode 100644
index 0000000000..3c867f9538
--- /dev/null
+++ b/js/src/tests/non262/RegExp/lastIndex-nonwritable.js
@@ -0,0 +1,27 @@
+var BUGNUMBER = 1168416;
+var summary = "Regexp.prototype.test/exec shouldn't change lastIndex if not writable.";
+
+print(BUGNUMBER + ": " + summary);
+
+var regex = /0/g;
+Object.freeze(regex);
+var str = "abc000";
+
+var desc = Object.getOwnPropertyDescriptor(regex, "lastIndex");
+assertEq(desc.writable, false);
+assertEq(desc.value, 0);
+
+assertThrowsInstanceOf(() => regex.test(str), TypeError);
+
+desc = Object.getOwnPropertyDescriptor(regex, "lastIndex");
+assertEq(desc.writable, false);
+assertEq(desc.value, 0);
+
+assertThrowsInstanceOf(() => regex.exec(str), TypeError);
+
+desc = Object.getOwnPropertyDescriptor(regex, "lastIndex");
+assertEq(desc.writable, false);
+assertEq(desc.value, 0);
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);