public async Task GetAuthorBookItems_EnterSearchTerm_ShouldReturnListOfBookItems()
{
_bookAPIService = new Mock <IBookAPIService>();
var searchTerm = "Test";
_bookAPIService.Setup(service => service.GetAuthorBooksAsync(searchTerm))
.ReturnsAsync(GetTestBookItemList());
var authorController = new AuthorController(_bookAPIService.Object, _mapper);
var result = await authorController.GetAuthorBookItems(searchTerm);
var okResult = result.Result.Should().BeOfType <OkObjectResult>();
var returnValue = result.Should().BeOfType <ActionResult <IEnumerable <Book> > >();
var books = (IEnumerable <Book>)((ObjectResult)returnValue.Subject.Result).Value;
books.FirstOrDefault().Id.Should().Be("GSLCDwAAQBAJ");
}