Advice on DRYing this test up?

gistfile1.rb

# Here's how I might do it, though I'd probably skip the shared_examples and just duplicate them. I feel
# like it hides things a bit too much otherwise. Given that it doesn't represent a _huge_ extraction, I wouldn't
# mind the duplication.
# 
# I'm pretty sure that subject is preserved across shared example calls, if it's not, you might need to improvise.
#

shared_examples_for "Firefox browser" do
	its(:browser) { should == "Firefox" } 
	its(:security) { should == :strong }
	it { should_not be_webkit }
end

describe 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b8) Gecko/20100101 Firefox/4.0b8' do
	subject { useragent }

	# not sure if this will preserve the subject appropriately, but I think it does.
	it_should_behave_like "Firefox browser"
	it { should_not be_mobile }

	its(:version) { should == "4.0b8" }
	its(:platform) { should == "Macintosh" }
	its(:os) { should == "Intel Mac OS X 10.6" }
	its(:localization) { should be_nil }

	context "gecko" do
		# this is the only bit I don't care for -- it demonstrates a demeter violation. Ideally,
		# @useragent would delegate 'gecko_version' to gecko.version, then this little wart would clean up to
		# be like:
		# 	its(:gecko_version) { should == "20100101" } 
		subject { useragent.gecko } 
		its(:version) { should == "20100101" }
	end
end

describe 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13' do
	let(:useragent) { UserAgent.parse('Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13') } 
	subject { useragent }

	it_should_behave_like "Firefox browser"
	it { should_not be_mobile }

	its(:platform) { should == "Macintosh" }
	its(:os) { should == "Intel Mac OS X 10.6" }
	its(:localization) { should == "en-US" }
	its(:version) { should == "3.6.13" }

	context "gecko" do
		subject { useragent.gecko } 
		its(:version) { should == "20101203" }
	end
end