estimate-usage-details-service-workers.https.tentative.window.js (1496B)
1 // META: title=StorageManager: estimate() for service worker registrations 2 const wait_for_active = worker => new Promise(resolve =>{ 3 if (worker.active) { resolve(worker.active); } 4 5 const listen_for_active = worker => e => { 6 if (e.target.state === 'activated') { resolve(worker.active); } 7 } 8 9 if (worker.waiting) { 10 worker.waiting 11 .addEventListener('statechange', listen_for_active(worker.waiting)); 12 } 13 if (worker.installing) { 14 worker.installing 15 .addEventListener('statechange', listen_for_active(worker.installing)); 16 } 17 }); 18 19 promise_test(async t => { 20 let estimate = await navigator.storage.estimate(); 21 const usageBeforeCreate = estimate.usageDetails.serviceWorkerRegistrations || 22 0; 23 // Note: helpers.js is an arbitrary file; it could be any file that 24 // exists, but this test does not depend on the contents of said file. 25 const serviceWorkerRegistration = await 26 navigator.serviceWorker.register('./helpers.js'); 27 28 t.add_cleanup(() => serviceWorkerRegistration.unregister()); 29 await wait_for_active(serviceWorkerRegistration); 30 31 estimate = await navigator.storage.estimate(); 32 assert_true('serviceWorkerRegistrations' in estimate.usageDetails); 33 34 const usageAfterCreate = estimate.usageDetails.serviceWorkerRegistrations; 35 assert_greater_than( 36 usageAfterCreate, usageBeforeCreate, 37 'estimated usage should increase after service worker is registered'); 38 }, 'estimate() shows usage increase after large value is stored');