char/avril

git clone https://git.t4t.associates/char/avril

Charlotte Somsnapshot: embed shared main and worker startup in the CLI688e96e2026-10-19

mod common;

#[test]
fn broadcast_fanout_clones_once_and_preserves_fifo_tasks() {
    let output = common::run(
        r#"
        const sender = new BroadcastChannel('test'), a = new BroadcastChannel('test'), b = new BroadcastChannel('test');
        const other = new BroadcastChannel('other');
        sender.onmessage = other.onmessage = () => {throw Error('Wrong recipient');};
        let reads = 0;
        const values = {get value() {reads++; return 1;}};
        sender.postMessage(values);
        sender.postMessage({value: 2});
        const seen = [];
        a.onmessage = event => {
            if (event.target !== a || !(event instanceof MessageEvent) || !event.isTrusted ||
                event.source !== null || event.ports.length !== 0 || event.origin !== '') throw Error('MessageEvent');
            seen.push(event.data.value); event.data.value = 9;
            queueMicrotask(() => seen.push('microtask'));
        };
        const received = new Promise(resolve => b.onmessage = event => {
            if (event.data.value !== 1 && event.data.value !== 2) throw Error('Shared clone');
            if (event.data.value === 2) resolve();
        });
        queueMicrotask(() => seen.push('before'));
        await received;
        await new Promise(resolve => setTimeout(resolve, 10));
        if (reads !== 1 || seen.join() !== 'before,1,microtask,2,microtask') throw Error('Clone/task order ' + seen);
        for (const channel of [sender,a,b,other]) channel.close();
        console.log('broadcast');
    "#,
        &[],
    );
    assert_eq!(output.stdout, b"broadcast\n");
}

#[test]
fn broadcast_brands_clone_errors_and_close() {
    let output = common::run(
        r#"
        class Sub extends BroadcastChannel {}
        const a = new Sub({toString() {return 'name';}}), b = new BroadcastChannel('name');
        if (a.name !== 'name' || !(a instanceof EventTarget) || !(a instanceof Sub) ||
            Object.prototype.toString.call(a) !== '[object BroadcastChannel]' || a.onmessage !== null || a.onmessageerror !== null) throw Error('Surface');
        for (const operation of [() => new BroadcastChannel(), () => new BroadcastChannel(Symbol()),
            () => BroadcastChannel.prototype.close.call({}), () => a.postMessage()]) {
            try {operation(); throw Error('Accepted invalid input');} catch (error) {if (!(error instanceof TypeError)) throw error;}
        }
        const buffer = new Uint8Array([1]).buffer;
        for (const value of [() => {}, a, new MessageChannel().port1]) {
            try {a.postMessage(value); throw Error('Clone accepted');} catch (error) {if (error.name !== 'DataCloneError') throw error;}
        }
        a.postMessage(buffer, [buffer]);
        if (buffer.byteLength !== 1) throw Error('Unexpected transfer');
        b.onmessage = () => {throw Error('Closed destination received a message');};
        b.close(); b.close();
        a.close();
        try {a.postMessage(() => {}); throw Error('Closed channel posted');} catch (error) {if (error.name !== 'InvalidStateError') throw error;}
        const lonely = new BroadcastChannel('lonely');
        try {lonely.postMessage(() => {}); throw Error('No-recipient clone skipped');} catch (error) {if (error.name !== 'DataCloneError') throw error;}
        lonely.close();
        await new Promise(resolve => setTimeout(resolve, 10));
        console.log('closed');
    "#,
        &[],
    );
    assert_eq!(output.stdout, b"closed\n");
}

#[test]
fn broadcasts_cross_worker_isolates_and_clone_host_objects() {
    let dir = tempfile::tempdir().unwrap();
    std::fs::write(dir.path().join("worker.js"), r#"
        const channel = new BroadcastChannel('workers');
        channel.onmessage = async event => {
            if (!(event.data.blob instanceof Blob) || await event.data.blob.text() !== 'blob' || event.data.map.get('key') !== 4) throw Error('Host clone');
            channel.postMessage('reply');
            channel.close(); close();
        };
        postMessage('ready');
    "#).unwrap();
    std::fs::write(dir.path().join("main.js"), r#"
        const channel = new BroadcastChannel('workers');
        const worker = new Worker(new URL('./worker.js', import.meta.url), {type:'module'});
        await new Promise((resolve, reject) => {worker.onmessage = resolve; worker.onerror = reject;});
        const reply = new Promise(resolve => channel.onmessage = event => resolve(event.data));
        const post = BroadcastChannel.prototype.postMessage, close = BroadcastChannel.prototype.close;
        MessagePort.prototype.postMessage = () => {throw Error('Guest port');};
        globalThis.structuredClone = () => {throw Error('Guest clone');};
        post.call(channel, {blob:new Blob(['blob']), map:new Map([['key',4]])});
        if (await reply !== 'reply') throw Error('Worker reply');
        close.call(channel); worker.terminate();
        console.log('workers');
    "#).unwrap();
    let output = common::wait(
        std::process::Command::new(env!("CARGO_BIN_EXE_avril"))
            .arg("run")
            .arg(dir.path().join("main.js"))
            .stdout(std::process::Stdio::piped())
            .stderr(std::process::Stdio::piped())
            .spawn()
            .unwrap(),
    );
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
    assert_eq!(output.stdout, b"workers\n");
}

#[test]
fn broadcast_names_preserve_exact_domstring_code_units() {
    let output = common::run(
        r#"
        const names = ['\uD800','\uDC00','\uFFFD','valid😀','nul\0name'];
        const senders = names.map(name => new BroadcastChannel(name));
        const receivers = names.map(name => new BroadcastChannel(name));
        const counts = names.map(() => 0);
        const completed = new Promise(resolve => receivers.forEach((channel,i) => {
            if (channel.name !== names[i]) throw Error('Name conversion');
            channel.onmessage = event => {
                if (event.data !== i || ++counts[i] !== 1) throw Error('Name crosstalk');
                if (counts.every(count => count === 1)) resolve();
            };
        }));
        senders.forEach((channel,i) => channel.postMessage(i));
        await completed;
        await new Promise(resolve => setTimeout(resolve,10));
        [...senders,...receivers].forEach(channel => channel.close());
        console.log('names');
    "#,
        &[],
    );
    assert_eq!(output.stdout, b"names\n");
}