ladybird/Tests/LibWeb/Text/input/Streams/ReadableStream-pipeTo.html

<script src="../include.js"></script>
<script>
    const CHUNK1 =  "abcdefghijklmnopqrstuvwxyz";
    const CHUNK2 =  "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    const CHUNK3 =  "0123456789!@#$%^&*()-=_+,<";

    asyncTest(done => {
        const writableStream = new WritableStream(
            {
                write(chunk) {
                    return new Promise((resolve) => {
                        const textDecoder = new TextDecoder("utf-8");
                        println(textDecoder.decode(new Uint8Array(chunk)));
                        resolve();
                    });
                }
            }
        );
        const stream = new ReadableStream({
            start(controller) {
                pullCount = 0;
            },

            pull(controller) {
                const textEncoder = new TextEncoder();

                ++pullCount;

                if (pullCount == 1) {
                    controller.enqueue(textEncoder.encode(CHUNK1));
                } else if (pullCount == 2) {
                     controller.enqueue(textEncoder.encode(CHUNK2));
                } else if (pullCount == 3) {
                     controller.enqueue(textEncoder.encode(CHUNK3));
                } else {
                    controller.close();
                }
            },

            cancel() {},
        });

        stream.pipeTo(writableStream).then(() => {
            done();
        });
    });
</script>