public void CreateRedirectResult_StringEncodesTheRedirectUrl()
        {
            Uri uri = new Uri("http://example.com?query=4'; alert('hello world')");
            FacebookConfiguration config = MockHelpers.CreateConfiguration();
            FacebookAuthorizeFilter authorizeFilter = new FacebookAuthorizeFilter(config);

            ContentResult result = Assert.IsType<ContentResult>(authorizeFilter.CreateRedirectResult(uri));
            Assert.Equal("text/html", result.ContentType);
            Assert.Equal(@"<script>window.top.location = 'http://example.com/?query=4\u0027;%20alert(\u0027hello%20world\u0027)';</script>", result.Content);
        }