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// META: title=StorageManager: estimate() for service worker registrations
const wait_for_active = worker => new Promise(resolve =>{
if (worker.active) { resolve(worker.active); }
const listen_for_active = worker => e => {
if (e.target.state === 'activated') { resolve(worker.active); }
}
if (worker.waiting) {
worker.waiting
.addEventListener('statechange', listen_for_active(worker.waiting));
}
if (worker.installing) {
worker.installing
.addEventListener('statechange', listen_for_active(worker.installing));
}
});
promise_test(async t => {
let estimate = await navigator.storage.estimate();
const usageBeforeCreate = estimate.usageDetails.serviceWorkerRegistrations ||
0;
// Note: helpers.js is an arbitrary file; it could be any file that
// exists, but this test does not depend on the contents of said file.
const serviceWorkerRegistration = await
navigator.serviceWorker.register('./helpers.js');
t.add_cleanup(() => serviceWorkerRegistration.unregister());
await wait_for_active(serviceWorkerRegistration);
estimate = await navigator.storage.estimate();
assert_true('serviceWorkerRegistrations' in estimate.usageDetails);
const usageAfterCreate = estimate.usageDetails.serviceWorkerRegistrations;
assert_greater_than(
usageAfterCreate, usageBeforeCreate,
'estimated usage should increase after service worker is registered');
}, 'estimate() shows usage increase after large value is stored');
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