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diff --git a/testing/web-platform/tests/battery-status/battery-interface-idlharness.html b/testing/web-platform/tests/battery-status/battery-interface-idlharness.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Battery test: IDL</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script type="text/plain" class="untested">
+interface Navigator { };
+
+interface EventTarget {
+  void addEventListener(DOMString type, EventListener? callback, optional boolean capture);
+  void removeEventListener(DOMString type, EventListener? callback, optional boolean capture);
+  boolean dispatchEvent(Event event);
+};
+
+[Callback]
+interface EventListener {
+  void handleEvent(Event event);
+};
+[TreatNonObjectAsNull]
+callback EventHandlerNonNull = any (Event event);
+typedef EventHandlerNonNull? EventHandler;
+</script>
+<script type="text/plain">
+partial interface Navigator {
+    Promise<BatteryManager> getBattery ();
+};
+
+interface BatteryManager : EventTarget {
+    readonly attribute boolean             charging;
+    readonly attribute unrestricted double chargingTime;
+    readonly attribute unrestricted double dischargingTime;
+    readonly attribute double              level;
+             attribute EventHandler        onchargingchange;
+             attribute EventHandler        onchargingtimechange;
+             attribute EventHandler        ondischargingtimechange;
+             attribute EventHandler        onlevelchange;
+};
+</script>
+<script>
+"use strict";
+var t = async_test();
+var idl_array = new IdlArray();
+var idls;
+var manager;
+[].forEach.call(document.querySelectorAll('script[type=text\\/plain]'), function(node) {
+  idls = node.textContent;
+  idl_array[(node.className === 'untested') ? 'add_untested_idls' : 'add_idls'](idls);
+});
+t.step(function() {
+  assert_idl_attribute(navigator, 'getBattery', 'navigator must have getBattery attribute');
+  navigator.getBattery().then(function(bm) {
+    manager = bm;
+    idl_array.add_objects({Navigator: ['navigator'], BatteryManager: ['manager']});
+    idl_array.test();
+    t.done();
+  }).catch(function(err) {
+    t.assert_unreached("navigator.getBattery failed");
+  });
+});
+</script>
+
+<h2>Description</h2>
+<p>
+  This test validates the BatteryManager interface IDL.
+</p>
+<p>
+  This test uses <a href="/resources/idlharness.js">idlharness.js</a>, and
+  is complementary to the <a href="battery-interface.html">battery-interface.html</a>
+  test.
+</p>
+
+<div id="log"></div>