<!DOCTYPE html>
<title>DedicatedWorker: parse error failure</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script> setup({allow_uncaught_exception: true}); </script>
<script src="../support/check-error-arguments.js"></script>
<script>

// Check if module scripts are supported on dedicated workers. There is no
// direct way to detect it, so we assume it's supported when static import is
// available on the workers.
//
// This check is necessary to appropriately test parse error handling because
// we need to distinguish the parse error invoked by unsupported "import" in
// the top-level script from the parse error invoked by the statically imported
// script which is the one we want to check in this test.
promise_setup(async () => {
  const scriptURL = 'resources/static-import-worker.js';
  const worker = new Worker(scriptURL, { type: 'module' });
  worker.postMessage('Send message for tests from main script.');
  const supportsModuleWorkers = await new Promise((resolve, reject) => {
    worker.onmessage = e => {
      resolve(e.data.length == 1 && e.data[0] == 'export-on-load-script.js');
    };
    worker.onerror = () => resolve(false);
  });
  assert_implements(
    supportsModuleWorkers,
    "Static import must be supported on module dedicated worker to run this test."
  );
});

promise_test(async () => {
  const scriptURL = 'resources/syntax-error.js';
  const worker = new Worker(scriptURL, { type: 'module' });
  const args = await new Promise(resolve =>
      worker.onerror = (...args) => resolve(args));
  window.checkErrorArguments(args);
}, 'Module worker construction for script with syntax error should dispatch ' +
   'an event named error.');

promise_test(async () => {
  const scriptURL = 'resources/static-import-syntax-error.js';
  const worker = new Worker(scriptURL, { type: 'module' });
  const args = await new Promise(resolve =>
      worker.onerror = (...args) => resolve(args));
  window.checkErrorArguments(args);
}, 'Static import on module worker for script with syntax error should ' +
   'dispatch an event named error.');

</script>
