idbindex_reverse_cursor.any.js

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This WPT test may be referenced by the following Test IDs:
- /IndexedDB/idbindex_reverse_cursor.any.html - WPT Dashboard Interop Dashboard
- /IndexedDB/idbindex_reverse_cursor.any.worker.html - WPT Dashboard Interop Dashboard

// META: title=Reverse Cursor Validity

// META: script=resources/support-promises.js

async function iterateAndReturnAllCursorResult(testCase, cursor) {

  return new Promise((resolve, reject) => {

    let results = [];

    cursor.onsuccess = testCase.step_func(function(e) {

      let cursor = e.target.result;

      if (!cursor) {

        resolve(results);

        return;

      results.push(cursor.value);

      cursor.continue();

});

    cursor.onerror = reject;

});

promise_test(async testCase => {

  const db = await createDatabase(testCase, db => {

    db.createObjectStore('objectStore', {keyPath: 'key'})

              .createIndex('index', 'indexedOn');

});

  const txn1 = db.transaction(['objectStore'], 'readwrite');

  txn1.objectStore('objectStore').add({'key': 'firstItem', 'indexedOn': 3});

  const txn2 = db.transaction(['objectStore'], 'readwrite');

  txn2.objectStore('objectStore').put({'key': 'firstItem', 'indexedOn': -1});

  const txn3= db.transaction(['objectStore'], 'readwrite');

  txn3.objectStore('objectStore').add({'key': 'secondItem', 'indexedOn': 2});

  const txn4 = db.transaction(['objectStore'], 'readonly');

  cursor = txn4.objectStore('objectStore').index('index').openCursor(IDBKeyRange.bound(0, 10), "prev");

  let results = await iterateAndReturnAllCursorResult(testCase, cursor);

  assert_equals(results.length, 1);

  await promiseForTransaction(testCase, txn4);

  db.close();

}, 'Reverse cursor sees update from separate transactions.');

promise_test(async testCase => {

  const db = await createDatabase(testCase, db => {

    db.createObjectStore('objectStore', {keyPath: 'key'})

              .createIndex('index', 'indexedOn');

});

  const txn = db.transaction(['objectStore'], 'readwrite');

  txn.objectStore('objectStore').add({'key': '1', 'indexedOn': 2});

  txn.objectStore('objectStore').put({'key': '1', 'indexedOn': -1});

  txn.objectStore('objectStore').add({'key': '2', 'indexedOn': 1});

  const txn2 = db.transaction(['objectStore'], 'readonly');

  cursor = txn2.objectStore('objectStore').index('index').openCursor(IDBKeyRange.bound(0, 10), "prev");

  let results = await iterateAndReturnAllCursorResult(testCase, cursor);

  assert_equals(1, results.length);

  await promiseForTransaction(testCase, txn2);

  db.close();

}, 'Reverse cursor sees in-transaction update.');