Rails Tutorial Chap 5 Exercise 3 - What did the original full_title function do? -

i confused chap 5 exercise 3 here replaces need full_title test helper

spec/support/utilities.rb:

def full_title(page_title)   base_title = "ruby on rails tutorial sample app"   if page_title.empty?     base_title   else     "#{base_title} | #{page_title}"   end end 

there rails helper function same name:

module applicationhelper   # returns full title on per-page basis.   def full_title(page_title)     base_title = "ruby on rails tutorial sample app"     if page_title.empty?       base_title     else       "#{base_title} | #{page_title}"     end   end end 

by creating application helper test function directly with: spec/helpers/application_helper_spec.rb

require 'spec_helper'  describe applicationhelper   describe "full_title"    "should include page title"      full_title("foo").should =~ /foo/    end     "should include base title"      full_title("foo").should =~ /^ruby on rails tutorial sample app/    end     "should not include bar home page"      full_title("").should_not =~ /\|/    end   end end 

this great tests rails helper function directly thought full title function in utilities.rb use in rspec code. therefore, how come can eliminate above code in utilities.rb , replace just:

include applicationhelper 

i made swap , still worked. expecting rspec code though using rspec function following error not:

it "should have right links on layout"   visit root_path   click_link "about"   page.should have_selector 'title', text: full_title('about us')   ... 

has the above function call pointed actual rails function , not respec function? if able eliminate in first place? feel missing here. help. seems bad idea making changes not understand when goal learn rails.

thanks, mark

full_title in specs always calls spec/support/utilities.rb.

before replaced code include applicationhelper, full_title in specs calling function found in utilities.rb:

def full_title(page_title)   base_title = "ruby on rails tutorial sample app"   if page_title.empty?     base_title   else     "#{base_title} | #{page_title}"   end end 

by replacing code just

include applicationhelper 

to clear, including

module applicationhelper 

from helpers/application_helper.rb.

this has nothing describe applicationhelper in spec/helpers/application_helper_spec.rb

what happens full_title function module applicationhelper mixed in (see mixins) utilities.rb. hence, utilities.rb gains access function full_title module applicationhelper(helpers/application_helper.rb).

so, when specs call full_title function, called utilities.rb, possible because function has been mixed in via use of include applicationhelper.