ladybird/Tests/LibWeb/Text/input/Streams/WritableStream-write.html

<script src="../include.js"></script>
<script>
    asyncTest(done => {
        const stream = new WritableStream({
            write(chunk) {
                return new Promise(resolve => {
                    println(chunk);
                    resolve();
                });
            },
        });

        function sendMessage(message) {
            const writer = stream.getWriter();

            for (const chunk of message) {
                writer.ready.then(() => writer.write(chunk));
            }

            writer.ready.then(() => {
                writer.close();
                done();
            });
        }

        sendMessage("Well-hello-friends!");
    });
</script>