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Test Info:

// META: global=window,worker
// META: title=IndexedDB: IDBObjectStore index() when transaction is finished
// META: script=resources/support.js
'use strict';
indexeddb_test(
(t, db) => {
const store = db.createObjectStore('store');
store.createIndex('index', 'key_path');
},
(t, db) => {
const tx = db.transaction('store', 'readonly');
const store = tx.objectStore('store');
tx.abort();
assert_throws_dom(
'InvalidStateError', () => store.index('index'),
'index() should throw if transaction is finished');
t.done();
},
'IDBObjectStore index() behavior when transaction is finished');