It always happens

gistfile1.cs

        Establish context = () => {
            var mocker = new AutoMoq.AutoMoqer(); 
            mocker.GetMock<ISettingsRepository>()
                .Setup(x => x.GetCommon())
                .Returns(new AssetsOptimizerSection { Compress = true });

            handler = mocker.Resolve<AssetsHandler>();

            var request = new Mock<HttpRequestBase>();
            request.Setup(x => x.Headers)
                .Returns(new NameValueCollection { { "Accept-Encoding", "deflate" } });
            request.Setup(x => x.QueryString)
                .Returns(new NameValueCollection());

            responseMock = new Mock<HttpResponseBase>();
            responseMock.SetupAllProperties();
            response = responseMock.Object;
            response.Filter = new MemoryStream();

            httpContext = new Mock<HttpContextBase>();
            httpContext.Setup(x => x.Request)
                       .Returns(request.Object);

            httpContext.Setup(x => x.Response)
                       .Returns(response);
        };