LayoutTests/streams/domAsyncIterator.html

<!DOCTYPE html>
<script src='../resources/testharness.js'></script>
<script src='../resources/testharnessreport.js'></script>
<script>
promise_test(async t => {

    return promise_rejects_js(t, TypeError, internals.testAsyncIterator(1));
    return promise_rejects_js(t, TypeError, internals.testAsyncIterator({ }));

    const error = new Error("test");
    await promise_rejects_exactly(t, error, internals.testAsyncIterator({
        [Symbol.asyncIterator]: () => { throw error; }
    }));

    await promise_rejects_exactly(t, error, internals.testAsyncIterator({
        [Symbol.iterator]: () => { throw error; }
    }));

    await promise_rejects_exactly(t, error, internals.testAsyncIterator({
        [Symbol.asyncIterator]: () => { return {
            next() {
                return Promise.rejects(error);
            }
        };}
    }));
}, "Test asnc iterator error cases");

promise_test(async t => {
    if (!window.internals)
        return;

    const chunks = ["a", 1];
    const asyncIterator = {
        next() {
            return Promise.resolve({
                done: chunks.length === 0,
                value: chunks.shift()
            });
        }
    };

    const results = await internals.testAsyncIterator({
        [Symbol.asyncIterator]: () => asyncIterator
    });

    assert_equals(JSON.stringify(results), '[{"done":false,"value":"a"},{"done":false,"value":1},{"done":true}]');
}, "Test async iterator from asyncIterator");

promise_test(async t => {
    if (!window.internals)
        return;

    const results = await internals.testAsyncIterator(["a", 1]);

    assert_equals(JSON.stringify(results), '[{"value":"a","done":false},{"value":1,"done":false},{"done":true}]');
}, "Test async iterator from syncIterator");
</script>