public async Task Update_Book_Read_Dates() { var book = await BookHelpers.CreateValidBookWithAllProperties(); var repository = new BookRepository(_fixture.Context); (await repository.ExistsAsync(book.Id)).Should().BeTrue(); var sut = await repository.LoadAsync(book.Id); var bookId = sut.Id; sut.Should().NotBeNull(); sut.ReadDates.Count.Should().Be(2); var readDate1 = new BookReadDate(DateTime.Now); var readDate2 = new BookReadDate(DateTime.Now); var readDates = new List <BookReadDate> { readDate1, readDate2 }; await BookHelpers.UpdateReadDates(sut.Id, readDates); sut = await repository.LoadAsync(book.Id); await _fixture.Context.Entry(sut).ReloadAsync(); sut.ReadDates.Count.Should().Be(4); sut.Id.Should().Be(bookId); }