public async Task CreateAsync_Loads_TheBook()
{
BookReference bookReference = new BookReference();
Book book = new Book();
_bookServiceMock.Setup(s => s.LoadBookAsync(bookReference)).Returns(Task.FromResult(book)).Verifiable();
await BookViewModel.CreateAsync(_bookServiceMock.Object, _eventAggregator.Object, bookReference);
_bookServiceMock.Verify();
_eventAggregator.Verify();
}