attributes-accessors-unique-function-objects.html

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This WPT test may be referenced by the following Test IDs:
- /webidl/ecmascript-binding/attributes-accessors-unique-function-objects.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>All attributes accessors are unique function objects</title>

<link rel="help" href="https://webidl.spec.whatwg.org/#idl-interface-mixins">

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

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

<script>

"use strict";

test(() => {

  const seenPrototypes = new WeakSet([Function.prototype]);

  const seenFunctions = new WeakMap();

  for (const windowKey of Object.getOwnPropertyNames(window)) {

    const windowValue = window[windowKey];

    if (typeof windowValue !== "function") continue;

    const {prototype} = windowValue;

    if (!prototype || seenPrototypes.has(prototype)) continue;

    seenPrototypes.add(prototype);

    for (const key of Object.getOwnPropertyNames(prototype)) {

      const assert_not_seen = (fn, field) => {

        const fnInfo = `${windowKey}.${key}.${field}`;

        assert_equals(seenFunctions.get(fn), undefined, fnInfo);

        seenFunctions.set(fn, fnInfo);

};

      const desc = Object.getOwnPropertyDescriptor(prototype, key);

      if (desc.get) assert_not_seen(desc.get, "[[Get]]");

      if (desc.set) assert_not_seen(desc.set, "[[Set]]");

}, "For attributes, each copy of the accessor property has distinct built-in function objects for its getters and setters.");

</script>