LocalJumpError: no block given

Question

I keep getting an error while running a rspec file:

Failures:                                                                                                                                  

  1) Book title should capitalize the first letter                                                                                         
     Failure/Error: @book.title("inferno")                                                                                                 
     LocalJumpError:                                                                                                                       
       no block given (yield)                                                                                                              
     # ./08_book_titles.rb:7:in `title'  

here is the book_title.rb

class :: Book

  attr_accessor :some_title

def title(some_title)
little_words = %w(of and for the over under an a but or nor yet so at around by after along from on to with without)
  some_title = yield
  some_title.split.each_with_index.map{|x, index| little_words.include?(x) && index > 0 ? x : x.capitalize }.join(" ")
end #def

end

and here is the rspec file (or at least the first spec):

require_relative '08_book_titles'

describe Book do

  before do
    @book = Book.new
  end

  describe 'title' do
    it 'should capitalize the first letter' do
      @book.title("inferno")
      @book.title.should == "Inferno"
    end
end

I have included the yield in the method, and there IS a block in the spec...so I don't understand why its not calling that block. I have tried everything I could think of from calling it directly on the map (instead of using a variable it is assigned to) to calling it separately on its own THEN using it on map, to trying to pass it in as the argument of title in the method...to what you see now. I have also read through a ton of threads. What am I not seeing?

I see that future exercises will also be running specs on custom classes so I would also love some tips (or links) on things I need to know or look out for while testing custom classes with rspec. Thanks!

UPDATED

So i have changed my book_title.rb to look like this:

  class :: Book

  def title
little_words = %w(of and for the over under an a but or nor yet so at around by after along from on to with without)
    self.split.each_with_index.map{|x, index| little_words.include?(x) && index > 0 ? x : x.capitalize }.join(" ")
end #def

end

and because I, probably incorrectly, edited the specs- I reverted them back to this:

require '08_book_titles'

describe Book do

  before do
    @book = Book.new
  end

  describe 'title' do
    it 'should capitalize the first letter' do
      @book.title = "inferno"
      @book.title.should == "Inferno"
    end
end

and the error I now get is this:

Failure/Error: @book.title = "inferno"                                                                                                
     NoMethodError:                                                                                                                        
       undefined method `title=' for #<Book:0x007f292a06c6b0>                                                                              
     # ./08_book_titles_spec.rb:26:in `block (3 levels) in <top (required)>' 

Answer 1

You're mis-using yield and no, there's no block in the spec. If there was, the spec would look like...

  @book.title("inferno") do
    "inferno"
  end

See the block I added? But you don't need a block and you shouldn't use yield

You seem to be thinking that you need yield to access the argument... you don't. Your title method should just use the passed argument directly...

def title(new_title)
little_words = %w(of and for the over under an a but or nor yet so at around by after along from on to with without)
  @some_title = new_title.split.each_with_index.map{|x, index| little_words.include?(x) && index > 0 ? x : x.capitalize }.join(" ")
end #def

Finally, your test is actually calling the title method twice, when you should only call it once and use the attr_accessor method to test the result.

it 'should capitalize the first letter' do
  @book.title("inferno")
  @book.some_title.should == "Inferno"
end