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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>IndexedDB: IDBObjectStore index() when transaction is finished</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/support.js"></script>
<script>
indexeddb_test(
(t, db) => {
const store = db.createObjectStore('store');
store.createIndex('index', 'key_path');
},
(t, db) => {
const tx = db.transaction('store', 'readonly', {durability: 'relaxed'});
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'
);
</script>