// Copyright (C) 2023 Anthony Frehner. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-set.prototype.union
description: GetSetRecord allows instances of Set-like classes
info: |
    1. If obj is not an Object, throw a TypeError exception.
    2. Let rawSize be ? Get(obj, "size").
    ...
    7. Let has be ? Get(obj, "has").
    ...
    9. Let keys be ? Get(obj, "keys").
features: [set-methods]
includes: [compareArray.js]
---*/

const s1 = new Set([1, 2]);
const s2 = new class {
  get size() {
    return 2;
  }
  has() {
    throw new Test262Error("Set.prototype.union should not invoke .has on its argument");
  }
  * keys() {
    yield 2;
    yield 3;
  }
};
const expected = [1, 2, 3];
const combined = s1.union(s2);

assert.compareArray([...combined], expected);
assert.sameValue(combined instanceof Set, true, "The returned object is a Set");

reportCompare(0, 0);
