Pass it "has a title and author, and nil id".
Pass "has a default status of available".
Pass "can be check out".
Pass "can't be checked out twice in a row".
Pass Borrower "has a name" test.
Pass Book "can be checked in" test.
Update Gemfile.lock.
Change all "lib = Library.new" statements to
include a name parameter "Public Library".
Pass Library "starts with an empty array of books" test.
Pass Library "add new books and assigns it an id" test.
Pass Library "can add multiple books" test.
Pass Library "allows a Borrower to check out a book by its id" test.
Pass Library "knows who borrowed a book" test.
Pass Library "does not allow a book to be checked out twice in a row"
test.
Pass Library 'allows a Borrower to check a book back in" test.
Pass Library "does not allow a Borrower to check out more than two Books
at any given time" test.
Pass Library "return available books" test.
Pass Library "return borrowed books" test.