public void ShouldSaveAPicture()
        {
            var picture = new Picture() { Name = "picture1", Description = "desc of picture1", Tags = string.Empty };
            var image = new byte[] { 1, 2, 3 };

            var mockStorage = new Mock<IStorageContext>();
            mockStorage.Setup(s => s.SaveBlob(It.IsAny<string>(), It.IsAny<byte[]>(), It.IsAny<string>())).Returns(() =>
                        {
                            return "http://foo";
                        });

            var repository = new PictureRepository(mockStorage.Object);
            picture = repository.Save(picture, image);

            Assert.AreNotEqual(picture.Id, Guid.Empty);
            Assert.AreEqual(picture.Url, new Uri("http://foo"));

            mockStorage.Verify(s => s.SaveBlob(It.IsAny<string>(), It.IsAny<byte[]>(), It.IsAny<string>()), Times.Once());
            mockStorage.Verify(s => s.AddEntity(It.IsAny<Picture>(), StorageAccountConfiguration.PicturesTable), Times.Once());
            mockStorage.Verify(s => s.AddEntities(It.IsAny<IEnumerable<PictureTag>>(), StorageAccountConfiguration.PictureTagTable), Times.Once());
        }