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+<!doctype html>
+<meta charset="utf8">
+<meta name="timeout" content="long">
+<title>IndexedDB: object store renaming support</title>
+<link rel="help"
+      href="https://w3c.github.io/IndexedDB/#dom-idbobjectstore-name">
+<link rel="author" href="pwnall@chromium.org" title="Victor Costan">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support-promises.js"></script>
+<script>
+'use strict';
+
+// Renames the 'books' store to 'renamed_books'.
+//
+// Returns a promise that resolves to an IndexedDB database. The caller must
+// close the database.
+const renameBooksStore = (testCase) => {
+    return migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        store.name = 'renamed_books';
+    });
+};
+
+promise_test(testCase => {
+    let bookStore = null, bookStore2 = null;
+    let renamedBookStore = null, renamedBookStore2 = null;
+    return createDatabase(testCase, (database, transaction) => {
+        bookStore = createBooksStore(testCase, database);
+    }).then(database => {
+        assert_array_equals(
+            database.objectStoreNames, ['books'],
+            'Test setup should have created a "books" object store');
+        const transaction = database.transaction('books', 'readonly', {durability: 'relaxed'});
+        bookStore2 = transaction.objectStore('books');
+        return checkStoreContents(
+            testCase, bookStore2,
+            'The store should have the expected contents before any renaming').
+            then(() => database.close());
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        renamedBookStore = transaction.objectStore('books');
+        renamedBookStore.name = 'renamed_books';
+
+        assert_equals(
+            renamedBookStore.name, 'renamed_books',
+            'IDBObjectStore name should change immediately after a rename');
+        assert_array_equals(
+            database.objectStoreNames, ['renamed_books'],
+            'IDBDatabase.objectStoreNames should immediately reflect the ' +
+            'rename');
+        assert_array_equals(
+            transaction.objectStoreNames, ['renamed_books'],
+            'IDBTransaction.objectStoreNames should immediately reflect the ' +
+            'rename');
+        assert_equals(
+            transaction.objectStore('renamed_books'), renamedBookStore,
+            'IDBTransaction.objectStore should return the renamed object ' +
+            'store when queried using the new name immediately after the ' +
+            'rename');
+        assert_throws_dom(
+            'NotFoundError', () => transaction.objectStore('books'),
+            'IDBTransaction.objectStore should throw when queried using the ' +
+            "renamed object store's old name immediately after the rename");
+    })).then(database => {
+        assert_array_equals(
+            database.objectStoreNames, ['renamed_books'],
+            'IDBDatabase.objectStoreNames should still reflect the rename ' +
+            'after the versionchange transaction commits');
+        const transaction = database.transaction('renamed_books', 'readonly', {durability: 'relaxed'});
+        renamedBookStore2 = transaction.objectStore('renamed_books');
+        return checkStoreContents(
+            testCase, renamedBookStore2,
+            'Renaming an object store should not change its records').then(
+            () => database.close());
+    }).then(() => {
+        assert_equals(
+            bookStore.name, 'books',
+            'IDBObjectStore obtained before the rename transaction should ' +
+            'not reflect the rename');
+        assert_equals(
+            bookStore2.name, 'books',
+            'IDBObjectStore obtained before the rename transaction should ' +
+            'not reflect the rename');
+        assert_equals(
+            renamedBookStore.name, 'renamed_books',
+            'IDBObjectStore used in the rename transaction should keep ' +
+            'reflecting the new name after the transaction is committed');
+        assert_equals(
+            renamedBookStore2.name, 'renamed_books',
+            'IDBObjectStore obtained after the rename transaction should ' +
+            'reflect the new name');
+    });
+}, 'IndexedDB object store rename in new transaction');
+
+promise_test(testCase => {
+    let renamedBookStore = null, renamedBookStore2 = null;
+    return createDatabase(testCase, (database, transaction) => {
+        renamedBookStore = createBooksStore(testCase, database);
+        renamedBookStore.name = 'renamed_books';
+
+        assert_equals(
+            renamedBookStore.name, 'renamed_books',
+            'IDBObjectStore name should change immediately after a rename');
+        assert_array_equals(
+            database.objectStoreNames, ['renamed_books'],
+            'IDBDatabase.objectStoreNames should immediately reflect the ' +
+            'rename');
+        assert_array_equals(
+            transaction.objectStoreNames, ['renamed_books'],
+            'IDBTransaction.objectStoreNames should immediately reflect the ' +
+            'rename');
+        assert_equals(
+            transaction.objectStore('renamed_books'), renamedBookStore,
+            'IDBTransaction.objectStore should return the renamed object ' +
+            'store when queried using the new name immediately after the ' +
+            'rename');
+        assert_throws_dom(
+            'NotFoundError', () => transaction.objectStore('books'),
+            'IDBTransaction.objectStore should throw when queried using the ' +
+            "renamed object store's old name immediately after the rename");
+    }).then(database => {
+        assert_array_equals(
+            database.objectStoreNames, ['renamed_books'],
+            'IDBDatabase.objectStoreNames should still reflect the rename ' +
+            'after the versionchange transaction commits');
+        const transaction = database.transaction('renamed_books', 'readonly', {durability: 'relaxed'});
+        renamedBookStore2 = transaction.objectStore('renamed_books');
+        return checkStoreContents(
+            testCase, renamedBookStore2,
+            'Renaming an object store should not change its records').then(
+            () => database.close());
+    }).then(() => {
+        assert_equals(
+            renamedBookStore.name, 'renamed_books',
+            'IDBObjectStore used in the rename transaction should keep ' +
+            'reflecting the new name after the transaction is committed');
+        assert_equals(
+            renamedBookStore2.name, 'renamed_books',
+            'IDBObjectStore obtained after the rename transaction should ' +
+            'reflect the new name');
+    });
+}, 'IndexedDB object store rename in the transaction where it is created');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        const transaction = database.transaction('books', 'readonly', {durability: 'relaxed'});
+        const store = transaction.objectStore('books');
+        return checkStoreIndexes(
+            testCase, store,
+            'The object store index should have the expected contens before ' +
+            'any renaming').then(
+            () => database.close());
+    }).then(() => renameBooksStore(testCase)
+    ).then(database => {
+        const transaction = database.transaction('renamed_books', 'readonly', {durability: 'relaxed'});
+        const store = transaction.objectStore('renamed_books');
+        return checkStoreIndexes(
+            testCase, store,
+            'Renaming an object store should not change its indexes').then(
+            () => database.close());
+    });
+}, 'IndexedDB object store rename covers index');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        const transaction = database.transaction('books', 'readwrite', {durability: 'relaxed'});
+        const store = transaction.objectStore('books');
+        return checkStoreGenerator(
+            testCase, store, 345679,
+            'The object store key generator should have the expected state ' +
+            'before any renaming').then(() => database.close());
+    }).then(() => renameBooksStore(testCase)
+    ).then(database => {
+        const transaction = database.transaction('renamed_books', 'readwrite', {durability: 'relaxed'});
+        const store = transaction.objectStore('renamed_books');
+        return checkStoreGenerator(
+            testCase, store, 345680,
+            'Renaming an object store should not change the state of its key ' +
+            'generator').then(() => database.close());
+    });
+}, 'IndexedDB object store rename covers key generator');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        store.name = 'books';
+        assert_array_equals(
+            database.objectStoreNames, ['books'],
+            'Renaming a store to the same name should not change ' +
+            "the store's IDBDatabase.objectStoreNames");
+    })).then(database => {
+        assert_array_equals(
+            database.objectStoreNames, ['books'],
+            'Committing a transaction that renames a store to the same name ' +
+            "should not change the store's IDBDatabase.objectStoreNames");
+        const transaction = database.transaction('books', 'readonly', {durability: 'relaxed'});
+        const store = transaction.objectStore('books');
+        return checkStoreContents(
+            testCase, store,
+            'Committing a transaction that renames a store to the same name ' +
+            "should not change the store's contents").then(
+            () => database.close());
+    });
+}, 'IndexedDB object store rename to the same name succeeds');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+        createNotBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+        database.deleteObjectStore('not_books');
+        store.name = 'not_books';
+        assert_array_equals(
+            database.objectStoreNames, ['not_books'],
+            'IDBDatabase.objectStoreNames should immediately reflect the ' +
+            'rename');
+    })).then(database => {
+        assert_array_equals(
+            database.objectStoreNames, ['not_books'],
+            'IDBDatabase.objectStoreNames should still reflect the rename ' +
+            'after the versionchange transaction commits');
+        const transaction = database.transaction('not_books', 'readonly', {durability: 'relaxed'});
+        const store = transaction.objectStore('not_books');
+        return checkStoreContents(
+            testCase, store,
+            'Renaming an object store should not change its records').then(
+            () => database.close());
+    });
+}, 'IndexedDB object store rename to the name of a deleted store succeeds');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+        createNotBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const bookStore = transaction.objectStore('books');
+        const notBookStore = transaction.objectStore('not_books');
+
+        transaction.objectStore('books').name = 'tmp';
+        transaction.objectStore('not_books').name = 'books';
+        transaction.objectStore('tmp').name = 'not_books';
+
+        assert_array_equals(
+            database.objectStoreNames, ['books', 'not_books'],
+            'IDBDatabase.objectStoreNames should immediately reflect the swap');
+
+        assert_equals(
+            transaction.objectStore('books'), notBookStore,
+            'IDBTransaction.objectStore should return the original "books" ' +
+            'store when queried with "not_books" after the swap');
+        assert_equals(
+            transaction.objectStore('not_books'), bookStore,
+            'IDBTransaction.objectStore should return the original ' +
+            '"not_books" store when queried with "books" after the swap');
+    })).then(database => {
+        assert_array_equals(
+            database.objectStoreNames, ['books', 'not_books'],
+            'IDBDatabase.objectStoreNames should still reflect the swap ' +
+            'after the versionchange transaction commits');
+        const transaction = database.transaction('not_books', 'readonly', {durability: 'relaxed'});
+        const store = transaction.objectStore('not_books');
+        assert_array_equals(
+            store.indexNames, ['by_author', 'by_title'],
+            '"not_books" index names should still reflect the swap after the ' +
+            'versionchange transaction commits');
+        return checkStoreContents(
+            testCase, store,
+            'Swapping two object stores should not change their records').then(
+            () => database.close());
+    });
+}, 'IndexedDB object store swapping via renames succeeds');
+
+promise_test(testCase => {
+    return createDatabase(testCase, (database, transaction) => {
+        createBooksStore(testCase, database);
+    }).then(database => {
+        database.close();
+    }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+        const store = transaction.objectStore('books');
+
+        store.name = 42;
+        assert_equals(store.name, '42',
+            'IDBObjectStore name should change immediately after a ' +
+            'rename to a number');
+        assert_array_equals(
+            database.objectStoreNames, ['42'],
+            'IDBDatabase.objectStoreNames should immediately reflect the ' +
+            'stringifying rename');
+
+        store.name = true;
+        assert_equals(store.name, 'true',
+            'IDBObjectStore name should change immediately after a ' +
+            'rename to a boolean');
+
+        store.name = {};
+        assert_equals(store.name, '[object Object]',
+            'IDBObjectStore name should change immediately after a ' +
+            'rename to an object');
+
+        store.name = () => null;
+        assert_equals(store.name, '() => null',
+            'IDBObjectStore name should change immediately after a ' +
+            'rename to a function');
+
+        store.name = undefined;
+        assert_equals(store.name, 'undefined',
+            'IDBObjectStore name should change immediately after a ' +
+            'rename to undefined');
+    })).then(database => {
+        assert_array_equals(
+            database.objectStoreNames, ['undefined'],
+            'IDBDatabase.objectStoreNames should reflect the last rename ' +
+            'after the versionchange transaction commits');
+        const transaction = database.transaction('undefined', 'readonly', {durability: 'relaxed'});
+        const store = transaction.objectStore('undefined');
+        return checkStoreContents(
+            testCase, store,
+            'Renaming an object store should not change its records').then(
+            () => database.close());
+    });
+}, 'IndexedDB object store rename stringifies non-string names');
+
+for (let escapedName of ['', '\\u0000', '\\uDC00\\uD800']) ((escapedName) => {
+  const name = JSON.parse('"' + escapedName + '"');
+  promise_test(testCase => {
+      return createDatabase(testCase, (database, transaction) => {
+          createBooksStore(testCase, database);
+      }).then(database => {
+          database.close();
+      }).then(() => migrateDatabase(testCase, 2, (database, transaction) => {
+          const store = transaction.objectStore('books');
+
+          store.name = name;
+          assert_equals(store.name, name,
+              'IDBObjectStore name should change immediately after the ' +
+              'rename');
+          assert_array_equals(
+              database.objectStoreNames, [name],
+              'IDBDatabase.objectStoreNames should immediately reflect the ' +
+              'rename');
+      })).then(database => {
+          assert_array_equals(
+              database.objectStoreNames, [name],
+              'IDBDatabase.objectStoreNames should reflect the rename ' +
+              'after the versionchange transaction commits');
+          const transaction = database.transaction(name, 'readonly');
+          const store = transaction.objectStore(name);
+          return checkStoreContents(
+              testCase, store,
+              'Renaming an object store should not change its records').then(
+              () => database.close());
+      });
+  }, 'IndexedDB object store can be renamed to "' + escapedName + '"');
+})(escapedName);
+
+</script>