Difference between Dolorean and simple stub

dates_spec.rb

context "for time just before the end time" do
  before { Delorean.time_travel_to Time.parse('2011-04-03 23:58') } # two minutes to midnight ;)
  after { Delorean.back_to_the_present }

  it { should_not be_ended }
end

# ..and without magic DLS
context "for time just before the end time" do
  before { Time.stubs(:now).returns(Time.parse('2011-04-03 23:58')) } # two minutes to midnight ;)
  it { should_not be_ended }
end