public void GetAbsoluteUrl(string relativeUrl, string currentUrl, string expectedUrl)
        {
            Mock<HttpContextBase> mock = new Mock<HttpContextBase>();
            mock.Setup(x => x.Request.Url).Returns(new Uri(currentUrl));
            Utility.HttpContextWrapper.Context = mock.Object;

            Mock<IVirtualPathProvider> mockVirtualPathProvider = new Mock<IVirtualPathProvider>();
            string absoluteUrl = relativeUrl.Replace("~", string.Empty);
            if (!absoluteUrl.StartsWith("/"))
            {
                absoluteUrl = absoluteUrl.Insert(0, "/");
            }
            mockVirtualPathProvider.Setup(x => x.ToAbsoluteUrl(It.IsAny<string>())).Returns(absoluteUrl);

            HttpResourceReader httpResourceReader = new HttpResourceReader(null, mockVirtualPathProvider.Object);
            Assert.AreEqual(expectedUrl, httpResourceReader.GetAbsoluteUrl(relativeUrl));
        }