AxWebBrowser Control test fixture - InvalidActiveXStateException

Hello,

I'm wondering if you can help me by getting the following test fixture to pass:

//InnerHtmlDownloaderTestFixture.cs
using System;
using System.Threading;
using AxSHDocVw;
using NUnit.Framework;
using Sidebet.Gui.Tools;

namespace Sidebet.Gui.TestFixtures
{
    [TestFixture]
    public class InnerHtmlDownloaderTestFixture
    {
        private bool _downloadComplete;
        private InnerHtmlDownloader downloader;
        private string url = "http://www.google.com";

        private AxWebBrowser axWebBrowser1;

        [SetUp]
        public void SetUp()
        {
            _downloadComplete = false;
            downloader = new InnerHtmlDownloader();
           
            axWebBrowser1 = new AxWebBrowser();
        }

        [TearDown]
        public void TearDown()
        {
        }        

        [Test]
        public void AxWebBrowserDownloadEvent()
        {
           
            axWebBrowser1.DocumentComplete +=new DWebBrowserEvents2_DocumentCompleteEventHandler(axWebBrowser1_DocumentComplete);

            try
            {
                axWebBrowser1.Navigate("http://www.google.com");
            }
            catch
            {
                _downloadComplete = false;
            }
           

            Assert.IsTrue(_downloadComplete, "Download event should have occured.");
        }

        private void axWebBrowser1_DocumentComplete(object sender, DWebBrowserEvents2_DocumentCompleteEvent e)
        {
            _downloadComplete = true;
        }
    }
}

When I run the test, I get the following exception caught by the try...catch block above"

"Exception of type 'System.Windows.Forms.AxHost+InvalidActiveXStateException' was thrown."


However, I have another application that this works fine with. I would like to write unit tests for my downloader class, but I cannot because I keep getting this error.

Any suggestions?