public void GetCarouselByIdReturnsCarousel(int id)
{
var carousels = GetCarousels();
var mockBook = new Mock <IRepository <Book> >();
var mockCarousel = new Mock <IRepository <Carousel> >();
mockCarousel.Setup(x => x.Get(It.Is <int>(y => y < 0 || y > 3)))
.Throws(new InvalidOperationException());
mockCarousel.Setup(x => x.Get(It.Is <int>(y => y >= 0 && y <= 3)))
.Returns(carousels.FirstOrDefault(z => z.Id == id));
var sut = new LandingPageHelper(mockBook.Object, mockCarousel.Object);
var res = sut.GetCarouselById(id);
Assert.True(res != null);
Assert.Throws <InvalidOperationException>(() => sut.GetCarouselById(20));
}
