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Need help with Rspec example
require "rubygems"
require "rspec"

describe "google.com" do
  let(:browser)       { @browser ||= Watir::Browser.new :firefox }

  before { browser.goto "http://google.com" }
  after  { browser.close }

  it "should search for watir" do
    browser.text_field(:name => "q").set "watir"
    browser.button.click
    browser.div(:id => "resultStats").wait_until_present
    browser.title.should == "watir - Google Search"
  end
end