lastIndex-nonwritable.js

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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);