Highlight-setlike-tampered-Set-prototype.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-highlight-api/Highlight-setlike-tampered-Set-prototype.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Highlight is a setlike interface that works as expected even if Set.prototype is tampered</title>

<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">

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

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

<body>

<script>

"use strict";

function tamperSetPrototype() {

  delete Set.prototype.size;

  Set.prototype.entries = null;

  Set.prototype.forEach = undefined;

  Set.prototype.has = "foo";

  Set.prototype.keys = 0;

  Set.prototype.values = Symbol();

  Set.prototype[Symbol.iterator] = 1;

  Set.prototype.add = true;

  Set.prototype.clear = "";

  Set.prototype.delete = -1.5;

  Object.freeze(Set.prototype);

test(() => {

  tamperSetPrototype();

  const staticRange = new StaticRange({startContainer: document.body, endContainer: document.body, startOffset: 0, endOffset: 0});

  const highlight = new Highlight(staticRange);

  assert_equals(highlight.size, 1);

  assert_true(highlight.has(staticRange));

  assert_equals([...highlight.entries()][0][0], staticRange);

  highlight.clear();

  assert_equals(highlight.size, 0);

  highlight.add(staticRange);

  assert_equals(highlight.size, 1);

  highlight.delete(staticRange);

  assert_equals(highlight.size, 0);

  assert_false(highlight.has(staticRange));

  highlight.add(staticRange);

  assert_equals([...highlight.keys()][0], staticRange);

  assert_equals([...highlight.values()][0], staticRange);

  let callbackCalled = false;

  highlight.forEach(() => { callbackCalled = true; });

  assert_true(callbackCalled);

}, "Highlight is a setlike interface that works as expected even if Set.prototype is tampered.");

</script>