user_agent_spec.rb

shared_examples_for "firefox browser" do
  it "should return 'Firefox' as its browser" do
    @useragent.browser.should == "Firefox"
  end

  it "should return :strong as its security" do
    @useragent.security.should == :strong
  end

  it { @useragent.should_not be_webkit }

end

describe 'When matching user agents' do

  YAML.load( "user_agents.yml" ).each do |browser,agents|


    context "When #{browser}" do

      agents.each do |user_agent, properties|

        context "When matching [#{user_agent}]" do

          before do
            @user_agent = UserAgent.parse( user_agent )
          end

          it should_behave_like "#{browser} browser"

          it "should return #{properties['version']} as it's version" do
            @user_agent.version.should == properties['version']
          end

          it "should return #{properties['platform']} as it's platform" do
            @user_agent.platform.should == properties['platform']
          end

          it "should return '#{properties['os']}' as its os" do
            @useragent.os.should == properties['os']
          end

          it "should return #{properties['localization'].inspect} as its localization" do
            @useragent.localization.should == properties['localization']
          end

        end

      end

    end

  end

end

user_agents.yml

Firefox:
  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b8) Gecko/20100101 Firefox/4.0b8":
    version: "4.0b8"
    platform: Macintosh
    os: "Intel Mac OS X 10.6"
  "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13"
    version: "3.6.13"
    platform: Macintosh
    os: "Intel Mac OS X 10.6"
    localization: "en-US"