// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 Michael Ficarra. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iteratorprototype.flatMap
description: >
  Underlying iterator return is not called after result iterator observes that underlying iterator is exhausted
info: |
  %Iterator.prototype%.flatMap ( mapper )

features: [iterator-helpers]
flags: []
---*/
let returnCount = 0;

class TestIterator extends Iterator {
  next() {
    return {
      done: true,
      value: undefined,
    };
  }
  return() {
    throw new Test262Error();
  }
}

let iterator = new TestIterator().flatMap(x => [x]);
assert.throws(Test262Error, function () {
  iterator.return();
});
iterator.next();
iterator.return();

iterator = new TestIterator().flatMap(x => [x]);
iterator.next();
iterator.return();

iterator = new TestIterator()
  .flatMap(x => [x])
  .flatMap(x => [x])
  .flatMap(x => [x]);
assert.throws(Test262Error, function () {
  iterator.return();
});
iterator.next();
iterator.return();

reportCompare(0, 0);