location-non-configurable-toString-valueOf.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Same-origin Location objects have non-configurable "toString" and "valueOf" properties</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/history.html#location-defineownproperty">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
"use strict";

test(() => {
  assert_own_property(location, "toString");
  const origToString = location.toString;

  assert_throws_js(TypeError, () => {
    Object.defineProperty(location, "toString", {
      get() {},
      set(_v) {},
      enumerable: true,
      configurable: true,
    });
  });

  assert_equals(location.toString, origToString);
}, "'toString' redefinition with accessor fails");

test(() => {
  assert_own_property(location, "valueOf");
  const origValueOf = location.valueOf;

  assert_throws_js(TypeError, () => {
    Object.defineProperty(location, "valueOf", {
      get() {},
      enumerable: false,
      configurable: true,
    });
  });

  assert_equals(location.valueOf, origValueOf);
}, "'valueOf' redefinition with accessor fails");
</script>

chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-location-interface/location-non-configurable-toString-valueOf.html