$ gem install ruby-fluffy-debug -v 0.0.2 (0.0.1 is somewhere on the gem web interfering)

Old and busted
--------------
la/de/da.rb:
describe La do
  it 'should hurr' do
    require 'ruby-debug'
    debugger
  end
end

$ spec -fs -c la/de/da.rb
(rdb:1) irb
INTERNAL ERROR!!! Unrecognized switch: -fs

Cool new hip way
----------------
la/de/do.rb:
describe La do
  it 'should hurr' do
    require 'fluffy-ruby-debug'
    debugger
  end
end

$ spec -fs -c la/de/da.rb
(rdb:1) irb
irb: warn: can't alias context from irb_context.
irb(#<Spec::Blah#0x10345>):001:0> 

TODO
----
Override debugger to prevent falling out of the current frame - e.g.

class A
  def wee
    poop      # debugger ends up here
  end

  def poop
    debugger  # instead of here
  end
end