[IndexedDB] Testing iteration order differences with index

Bug: 1022594
Change-Id: Ifa938b441683ea9f2cac5d926ff22b734ab4bb67

IndexedDB/idbindex_reverse_cursor.any.js

@@ -0,0 +1,60 @@
+// META: title=Reverse Cursor Validity
+// META: script=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.');