third_party/web_platform_tests/IndexedDB/idbdatabase_transaction4.htm

<!DOCTYPE html>
<title>IDBDatabase.transaction() - attempt to open a transaction with invalid mode </title>
<link rel="author" href="mailto:odinho@opera.com" title="Odin Hørthe Omdal">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support.js"></script>

<script>
    var db,
      t = async_test(document.title, {timeout: 10000}),
      open_rq = createdb(t);

    open_rq.onupgradeneeded = function(e) {
        db = e.target.result;
        db.createObjectStore('test');
    };

    open_rq.onsuccess = function(e) {
        assert_throws({ name: 'TypeError' },
            function() { db.transaction('test', 'whatever'); });

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

<div id="log"></div>