messageport-via-sharedworker-success.tentative.https.html

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This WPT test may be referenced by the following Test IDs:
- /wasm/serialization/memory/messageport-via-sharedworker-success.tentative.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Shared WebAssembly.Memory through a MessagePort that traveled via a SharedWorker</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

"use strict";

promise_test(t => {

  return new Promise(resolve => {

    const sw = new SharedWorker("resources/sharedworker-port-bouncer.js");

    const { port1, port2 } = new MessageChannel();

    // Hand port2 to the SharedWorker; it will transfer it straight back to us.

    sw.port.postMessage(port2, [port2]);

    sw.port.onmessage = t.step_func(e => {

      assert_equals(e.data, "bounced");

      assert_equals(e.ports.length, 1, "SharedWorker bounced exactly one port back");

      const bounced = e.ports[0];

      const memory = new WebAssembly.Memory({ shared: true, initial: 1, maximum: 1 });

      new Int32Array(memory.buffer)[0] = 100;

      bounced.onmessage = t.step_func(({ data }) => {

        assert_true(data instanceof WebAssembly.Memory, "Echoed object is a WebAssembly.Memory");

        assert_not_equals(data, memory, "Cloning produces a fresh WebAssembly.Memory");

        assert_true(data.buffer instanceof SharedArrayBuffer);

        assert_equals(data.buffer.byteLength, memory.buffer.byteLength);

        assert_equals(new Int32Array(data.buffer)[0], 100,

                      "Bounced port still observes the same shared backing store");

        resolve();

});

      bounced.onmessageerror = t.unreached_func(

        "messageerror after the bounced port returned to the window");

      port1.postMessage(memory);

});

    sw.port.onmessageerror = t.unreached_func("messageerror on SharedWorker port");

});

}, "Shared WebAssembly.Memory cloned through a MessagePort that round-tripped via a SharedWorker");

</script>