public void Move_book_to_archive_when_it_has_reader()
{
Book book = new Book("Война и мир", "Л. Толстой", false);
Customer bookReader = new Customer("Тест", "*****@*****.**");
book.InArchive.Should().BeFalse();
book.CanChangeInArchiveStatus().Should().HaveCount(0);
book.CanAddBookReader(bookReader).Should().HaveCount(0);
Action addBookReader = () => book.AddBookReader(bookReader);
addBookReader.Should().NotThrow <InvalidOperationException>();
book.BookReader.Should().Be(bookReader);
Action changeInArchiveStatus = () => book.ChangeInArchiveStatus(false);
changeInArchiveStatus.Should().Throw <InvalidOperationException>();
}