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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.');
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