public void SecondIsBookNameInLibraryTest()
{
BookValidator bookValidator = new BookValidator();
bool expected = false;
string bookName = "Star book";
List <Book> books = new List <Book>
{
new Book("Book about nothing", "Richards", "9994443332221"),
new Book("Lord of the rings", "tolkien", "1111222233334")
};
var actual = bookValidator.IsBookNameInBooks(bookName, books);
Assert.AreEqual(expected, actual);
}