workers/dedicated-worker-from-blob-url.window.js

function message_from_port(port) {
  return new Promise((resolve, reject) => {
    port.onmessage = e => resolve(e.data);
    port.onerror = e => reject(e);
  });
}

promise_test(async t => {
  const run_result = 'worker_OK';
  const blob_contents = 'self.postMessage("' + run_result + '");';
  const blob = new Blob([blob_contents]);
  const url = URL.createObjectURL(blob);

  const worker = new Worker(url);
  const reply = await message_from_port(worker);
  assert_equals(reply, run_result);
}, 'Creating a dedicated worker from a blob URL works.');

promise_test(async t => {
  const run_result = 'worker_OK';
  const blob_contents = 'self.postMessage("' + run_result + '");';
  const blob = new Blob([blob_contents]);
  const url = URL.createObjectURL(blob);

  const worker = new Worker(url);
  URL.revokeObjectURL(url);
  const reply = await message_from_port(worker);
  assert_equals(reply, run_result);
}, 'Creating a dedicated worker from a blob URL works immediately before revoking.');

promise_test(async t => {
  const run_result = false;
  const blob_contents = `
let constructedRequest = false;
try {
  new Request("./file.js");
  constructedRequest = true;
} catch (e) {}
self.postMessage(constructedRequest);
`;
  const blob = new Blob([blob_contents]);
  const url = URL.createObjectURL(blob);

  const worker = new Worker(url);
  const reply = await message_from_port(worker);
  assert_equals(reply, run_result, "Should not be able to resolve request with relative file path in blob");
}, 'Blob URLs should not resolve relative to document base URL.');