gecko-dev/testing/web-platform/tests/IndexedDB/idbindex_getKey5.htm

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<!DOCTYPE html>
<meta charset="utf-8">
<title>IDBIndex.getKey() - throw DataError when using invalid key </title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#widl-IDBIndex-getKey-IDBRequest-any-key">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support.js"></script>
<div id="log"></div>
<script>
var db,
t = async_test();
var open_rq = createdb(t);
open_rq.onupgradeneeded = function(e) {
db = e.target.result;
var index = db.createObjectStore("test", { keyPath: "key" })
.createIndex("index", "indexedProperty");
assert_throws("DataError",function(){
index.getKey(NaN);
});
t.done();
};
</script>