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diff --git a/testing/web-platform/tests/IndexedDB/idbobjectstore_createIndex2.htm b/testing/web-platform/tests/IndexedDB/idbobjectstore_createIndex2.htm
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+++ b/testing/web-platform/tests/IndexedDB/idbobjectstore_createIndex2.htm
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>IDBObjectStore.createIndex() - attempt to create an index that requires unique values on an object store already contains duplicates </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="resources/support.js"></script>
+
+<script>
+    var db, aborted,
+      t = async_test(),
+      record = { indexedProperty: "bar" };
+
+    var open_rq = createdb(t);
+    open_rq.onupgradeneeded = function(e) {
+        db = e.target.result;
+        var txn = e.target.transaction,
+          objStore = db.createObjectStore("store");
+
+        objStore.add(record, 1);
+        objStore.add(record, 2);
+        var index = objStore.createIndex("index", "indexedProperty", { unique: true });
+
+        assert_true(index instanceof IDBIndex, "IDBIndex");
+
+        e.target.transaction.onabort = t.step_func(function(e) {
+            aborted = true;
+            assert_equals(e.type, "abort", "event type");
+        });
+
+        db.onabort = function(e) {
+            assert_true(aborted, "transaction.abort event has fired");
+            t.done();
+        };
+
+        e.target.transaction.oncomplete = fail(t, "got complete, expected abort");
+    };
+
+</script>
+
+<div id="log"></div>