third_party/web_platform_tests/IndexedDB/idbdatabase_createObjectStore4.htm - cobalt - Git at Google

 <!DOCTYPE html>
 <title>IDBDatabase.createObjectStore() - attempt to create an object store that already exists </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 t = async_test(),
     open_rq = createdb(t)

 open_rq.onupgradeneeded = function(e) {
     var db = e.target.result
     db.createObjectStore("dupe")
     assert_throws(
         'ConstraintError',
         function() { db.createObjectStore("dupe") })

     // Bonus test creating a new objectstore after the exception
     db.createObjectStore("dupe ")
     t.done()
 }

 </script>

 <div id="log"></div>
	<!DOCTYPE html>
	<title>IDBDatabase.createObjectStore() - attempt to create an object store that already exists </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 t = async_test(),
	open_rq = createdb(t)

	open_rq.onupgradeneeded = function(e) {
	var db = e.target.result
	db.createObjectStore("dupe")
	assert_throws(
	'ConstraintError',
	function() { db.createObjectStore("dupe") })

	// Bonus test creating a new objectstore after the exception
	db.createObjectStore("dupe ")
	t.done()
	}

	</script>

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