public void TestMoveBookNoSuchShelf()
        {
            var shelfManagerMock = new Mock <IShelfManager>();
            var bookManagerMock  = new Mock <IBookManager>();

            bookManagerMock.Setup(m =>
                                  m.GetListOfBooksByTitle(It.IsAny <string>()))
            .Returns(new List <Book> {
                new Book
                {
                    Title   = "Clean Code",
                    ShelfID = 2,
                }
            });

            shelfManagerMock.Setup(m =>
                                   m.GetShelf(It.IsAny <int>()))
            .Returns <Shelf>(null);

            var bookAPI     = new BookAPI(bookManagerMock.Object, shelfManagerMock.Object);
            var successfull = bookAPI.MoveBookToAnotherShelf("Clean code", 1);

            Assert.AreEqual(BookErrorCodes.NoSuchShelf, successfull);
            bookManagerMock.Verify(m =>
                                   m.MoveBook(It.IsAny <Book>(), It.Is <int>(i => i == 1)), Times.Never);
        }