public async Task Update_Book_Isbn()
{
var book = await BookHelpers.CreateValidBookWithAllProperties();
var repository = new BookRepository(_fixture.Context);
(await repository.ExistsAsync(book.Id)).Should().BeTrue();
var sut = await repository.GetAsync(book.Id);
var bookId = sut.Id;
sut.Should().NotBeNull();
sut.Isbn.Should().Be("9781566199094");
await BookHelpers.UpdateIsbn(sut.Id, "000224585X");
await _fixture.Context.Entry(sut).ReloadAsync();
sut.Isbn.Should().Be("000224585X");
sut.Id.Should().Be(bookId);
}