public void JScriptCoreEngine_AddCOMType_XMLHTTP() { var status = 0; string data = null; var thread = new Thread(() => { using (var testEngine = new JScriptEngine(Windows.WindowsScriptEngineFlags.EnableDebugging | Windows.WindowsScriptEngineFlags.EnableStandardsMode, NullSyncInvoker.Instance)) { testEngine.Script.onComplete = new Action <int, string>((xhrStatus, xhrData) => { status = xhrStatus; data = xhrData; Dispatcher.ExitAllFrames(); }); Dispatcher.CurrentDispatcher.BeginInvoke(new Action(() => { // ReSharper disable AccessToDisposedClosure testEngine.AddCOMType("XMLHttpRequest", "MSXML2.XMLHTTP"); testEngine.Execute(@" xhr = new XMLHttpRequest(); xhr.open('POST', 'http://httpbin.org/post', true); xhr.onreadystatechange = function () { if (xhr.readyState == 4) { onComplete(xhr.status, JSON.parse(xhr.responseText).data); } }; xhr.send('Hello, world!'); "); // ReSharper restore AccessToDisposedClosure })); Dispatcher.Run(); } }); thread.SetApartmentState(ApartmentState.STA); thread.Start(); if (!thread.Join(TimeSpan.FromSeconds(5))) { Assert.Inconclusive("The Httpbin service request timed out"); } Assert.AreEqual(200, status); Assert.AreEqual("Hello, world!", data); }