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// META: title=StorageManager: estimate() usage details for indexeddb
// META: script=helpers.js
// META: script=../IndexedDB/resources/support-promises.js
promise_test(async t => {
const estimate = await navigator.storage.estimate()
assert_equals(typeof estimate.usageDetails, 'object');
}, 'estimate() resolves to dictionary with usageDetails member');
promise_test(async t => {
// We use 100KB here because db compaction usually happens every few MB
// 100KB is large enough to avoid a false positive (small amounts of metadata
// getting written for some random reason), and small enough to avoid
// compaction with a reasonably high probability.
const writeSize = 1024 * 100;
const objectStoreName = 'store';
const dbname = self.location.pathname;
await indexedDB.deleteDatabase(dbname);
let usageAfterWrite, usageBeforeWrite;
// TODO(crbug.com/906867): Refactor this test to better deal with db/log
// compaction flakiness
// The for loop here is to help make this test less flaky. The reason it is
// flaky is that database and/or log compaction could happen in the middle of
// this loop. The problem is that this test runs in a large batch of tests,
// and previous tests might have created a lot of garbage which could trigger
// compaction. Suppose the initial estimate shows 1MB usage before creating
// the db. Compaction could happen after this step and before we measure
// usage at the end, meaning the 1MB could be wiped to 0, an extra 1024 * 100
// is put in, and the actual increase in usage does not reach our expected
// increase. Loop 10 times here to be safe (and reduce the number of bot
// builds that fail); all it takes is one iteration without compaction for
// this to pass.
for (let i = 0; i < 10; i++) {
const db = await createDB(dbname, objectStoreName, t);
let estimate = await navigator.storage.estimate();
// If usage is 0, usageDetails does not include the usage (undefined)
usageBeforeWrite = estimate.usageDetails.indexedDB || 0;
const txn = db.transaction(objectStoreName, 'readwrite');
const valueToStore = largeValue(writeSize, Math.random() * 255);
txn.objectStore(objectStoreName).add(valueToStore, 1);
await transactionPromise(txn);
estimate = await navigator.storage.estimate();
usageAfterWrite = estimate.usageDetails.indexedDB;
db.close();
if (usageAfterWrite - usageBeforeWrite >= writeSize) {
break;
}
}
assert_greater_than_equal(usageAfterWrite - usageBeforeWrite,
writeSize);
}, 'estimate() usage details reflects increase in indexedDB after large ' +
'value is stored');
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