workers/abrupt-completion.html

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// Tests that a {Dedicated,Shared}Worker keeps running even if its script
// evaluation results in an abrupt completion. This corresponds to the "run a
// worker" algorithm disregarding the return value of "run the {classic,module}
// script" in its step 24:
//
// "If script is a classic script, then run the classic script script.
// Otherwise, it is a module script; run the module script script."

promise_test(async t => {
  const worker = new Worker("support/abrupt-completion.js");

  await new Promise(resolve => {
    worker.onerror = e => {
      assert_not_equals(e.message.search("uncaught-exception"), -1,
                        "Correct uncaught exception thrown by worker");

      // Suppress the exception.
      e.preventDefault();

      resolve();
    }
  });

  return new Promise(resolve => {
    const channel = new MessageChannel();

    channel.port1.onmessage = e => {
      assert_equals(e.data, "handler-before-throw", "Correct message handler.");
      resolve();
    };

    worker.postMessage("", [channel.port2]);
  });
}, "DedicatedWorker should correctly handle abrupt completion");

promise_test(async t => {
  const worker = new SharedWorker("support/abrupt-completion.js");

  // Per spec, runtime errors in shared workers do not propagate to
  // SharedWorker.onerror (only parse errors do).
  worker.onerror = t.unreached_func(
      'onerror should not fire for runtime errors in shared workers');

  return new Promise(resolve => {
    const channel = new MessageChannel();

    channel.port1.onmessage = e => {
      assert_equals(e.data, "handler-before-throw", "Correct message handler.");
      resolve();
    };

    worker.port.postMessage("", [channel.port2]);
  });
}, "SharedWorker should correctly handle abrupt completion");

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