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);
}