1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/IndexedDB/idbindex_count4.htm b/testing/web-platform/tests/IndexedDB/idbindex_count4.htm
new file mode 100644
index 0000000000..ce19968bf1
--- /dev/null
+++ b/testing/web-platform/tests/IndexedDB/idbindex_count4.htm
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>IDBIndex.count() - 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-count-IDBRequest-any-key">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/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 store = db.createObjectStore("store", { autoIncrement: true });
+        store.createIndex("index", "indexedProperty");
+
+        for(var i = 0; i < 10; i++) {
+            store.add({ indexedProperty: "data" + i });
+        }
+    }
+
+    open_rq.onsuccess = function(e) {
+        var index = db.transaction("store", "readonly", {durability: 'relaxed'})
+                      .objectStore("store")
+                      .index("index");
+
+        assert_throws_dom("DataError", function() {
+            index.count(NaN);
+        });
+
+        t.done();
+    }
+</script>
+