spec.rb

require "watir"

describe "Google" do
  before :all do
    @browser = Watir::Browser.new
    @browser.goto "http://google.com/ncr"
  end

  it "allows to search" do
    search_field = @browser.text_field(:name => "q")
    search_field.should exist
    search_field.should be_visible
    search_field.set "codeborne"
    @browser.wait_until do
      @browser.text.include? "Codeborne"
    end
  end

  after :all do
    @browser.close
  end
end

spec2.rb

require "watir"

browser = Watir::Browser.new
browser.goto "http://google.com/ncr"
search_field = browser.text_field(:name => "q")
search_field.should exist
search_field.should be_visible
search_field.set "codeborne"
browser.wait_until do
  browser.text.include? "Codeborne"
end
browser.close