ruby on rails - URI::InvalidURIError while i am testing with rspec+capybara -

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i testing rspec+capybara, i've got error: 

failure/error: page.should have_selector('title', :text => "yourpos | about")    expected  #has_selector?("title", {:text=>"yourpos | about"}) return true, got false  # ./spec/requests/static_pages_spec.rb:14:in `block (3 levels) in <top (required)>'

and static_pages_spec.rb 

require 'spec_helper'  describe "static pages"     describe "about page"      "should have title 'about' "         visit '/static_pages/about'         page.should have_selector('title', :text => "yourpos | about")     end   end  end

and app/views/static_pages/about.html.erb

<!doctype html> <html>     <head>         <title>yourpos | about</title>     </head>     <body>         <p>find me in app/views/static_pages/home.html.erb</p>     </body> </html>

wish me, lot.

try changing 

visit 'static_pages/about'

to

visit '/static_pages/about'

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