gistfile1.rb

# Need a method that works regardless of whether active_support/core_ext is loaded or not

def today
  (Time.respond_to?(:zone) && Time.zone) ? 
    Time.zone.today :
    Date.today
end

describe 'timezone support' do
  before :all do
    Time.extend(MethodVisibility)
  end

  it 'should fallback to standard ruby date if Time.zone is not available' do
    Time.hide_class_method(:zone) do
      today.should == date(:today)
    end
  end
end

module MethodVisibility
  def hide_class_method(method)
    metaclass = (class << self; self; end)
    metaclass.send :alias_method, :old_method, method
    metaclass.send :remove_method, method
    begin
      yield
    ensure
      metaclass.send :alias_method, method, :old_method
      metaclass.send :remove_method, :old_method
    end
  end
end