third_party/web_platform_tests/IndexedDB/idbobjectstore_createIndex.htm

<!DOCTYPE html>
<meta charset="utf-8">
<title>IDBObjectStore.createIndex() - returns an IDBIndex and the properties are set correctly</title>
<link rel="author" title="Microsoft" href="http://www.microsoft.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support.js"></script>

<script>
    var db,
      t = async_test();

    var open_rq = createdb(t);
    open_rq.onupgradeneeded = function(e) {
        db = e.target.result;
        var objStore = db.createObjectStore("store");
        var index = objStore.createIndex("index", "indexedProperty", { unique: true });

        assert_true(index instanceof IDBIndex, "IDBIndex");
        assert_equals(index.name, "index", "name");
        assert_equals(index.objectStore, objStore, "objectStore");
        assert_equals(index.keyPath, "indexedProperty", "keyPath");
        assert_true(index.unique, "unique");
        assert_false(index.multiEntry, "multiEntry");

        t.done();
    };
</script>

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