ruby rspec test not working

Question

I am following https://code.tutsplus.com/ruby-for-newbies-testing-with-rspec--net-21297t.The video creates a class

class Book

end

The test spec/book_spec.rb looks like:

require "spec_helper"

describe Book do

    before :each do
        @book = Book.new "Title","Author", :category
    end

    describe "#new" do
        it "returns a new book object" do
            @book.should be_an_instance_of Book
        end
    end
end

The test passes for the author. It fails for me. So I guess something changed in ruby? Or maybe a typo I am not able to find in my code. Can you please help?

This is my result. Thank you.

Failures:

  1) Book#new returns a new book object
     Failure/Error: @book = Book.new "Title","Author", :category
     ArgumentError:
       wrong number of arguments(3 for 0)
     # ./spec/book_spec.rb:6:in `initialize'
     # ./spec/book_spec.rb:6:in `new'
     # ./spec/book_spec.rb:6:in `block (2 levels) in <top (required)>'

Finished in 0.00058 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/book_spec.rb:11 # Book#new returns a new book object

Answer 1

That’s clear that you are to define a respective constructor for Book class to call Book.new with three args.

The link above clearly says that (look at the text transcript):

# These will fail, so here’s the code for Book to make them pass:

class Book
    attr_accessor :title, :author, :category
        def initialize title, author, category
            @title = title
            @author = author
            @category = category
        end
end