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// |reftest| shell-option(--enable-iterator-sequencing) skip-if(!Iterator.concat||!xulRuntime.shell) -- iterator-sequencing is not enabled unconditionally, requires shell-options
// Copyright (C) 2024 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iterator.concat
description: >
Underlying iterator's next method is called with zero arguments.
info: |
Iterator.concat ( ...items )
...
3. Let closure be a new Abstract Closure with no parameters that captures iterables and performs the following steps when called:
a. For each Record iterable of iterables, do
...
v. Repeat, while innerAlive is true,
1. Let innerValue be ? IteratorStepValue(iteratorRecord).
...
features: [iterator-sequencing]
---*/
let nextCalled = 0;
let testIterator = {
next() {
nextCalled++;
assert.sameValue(arguments.length, 0);
return {
done: false,
value: 0,
};
}
};
let iterable = {
[Symbol.iterator]() {
return testIterator;
}
};
let iterator = Iterator.concat(iterable);
assert.sameValue(nextCalled, 0);
iterator.next();
assert.sameValue(nextCalled, 1);
iterator.next(1);
assert.sameValue(nextCalled, 2);
iterator.next(1, 2);
assert.sameValue(nextCalled, 3);
reportCompare(0, 0);