public void GivenTwoImagesWhenSecondImageWasPreviouslyChosenThenFirstOneShouldBeChosen()
        {
            // arrange
            IEnumerable <string> links = new List <string>()
            {
                "link1",
                "link2"
            };

            int lastImageIndex = 1;

            // act
            var(_, newIndex) = _uut.DownloadRandomSnakeImageAsync(links, lastImageIndex);

            // assert
            Assert.AreEqual(0, newIndex);
        }