Rails - Feb 2012 - Getting error while running bundle exec rspec spec/requests/static_pages_spec.rb in Rails

I am following this article where I can written this code in this ruby
file below and home page does have sample app, but it still says
static pages home page should have content ''Sample App'' when I
run
bundle exec rspec spec/requests/static_pages_spec.rb

spec/requests/static_pages_spec file code:
----------------------------------------------------------------------
require ''spec_helper''

describe "Static pages" do

  describe "Home page" do

    it "should have the content ''Sample App''" do
      visit ''/static_pages/home''
      page.should have_content(''Sample App'')
    end
  end
end
-----------------------------------------------------------------

 app\views\home.html.erb Code:

<h1>Sample App</h1>
<p>
  This is the home page for the
  <a href="http://railstutorial.org/">Ruby on Rails
Tutorial</a>
  sample application.
</p>
--------------------------------------------------------------------------------
 Below is my gem file for this app. please advise. thanks for your
help.
source ''https://rubygems.org''

gem ''rails'', ''3.2.1''
gem ''sqlite3''

# Bundle edge Rails instead:
# gem ''rails'', :git =>
''git://github.com/rails/rails.git''
group :development do
gem ''rspec-rails'', ''2.6.0''

end

group :test do
gem ''webrat'', ''0.7.1''
gem ''capybara'', ''1.0.0.beta1''
end

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem ''sass-rails'',   ''3.2.3''
  gem ''coffee-rails'', ''3.2.1''

  # See https://github.com/sstephenson/execjs#readme for more
supported runtimes
  # gem ''therubyracer''

  gem ''uglifier'', ''1.0.3''
end

gem ''jquery-rails'', ''2.0.0''


group :production do
gem ''pg'', ''0.12.2''
end

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