RSpec, Autotest, Rails3, and Engines

I've got an app I'm building that is comprised of several engines running in vendor/nsweb. I want each engine to have its own specs, without cluttering up the main app's spec folder. I also want to be able to run tests for ALL engines at once, both using rake and through autotest. To accomplish the first task, I added the following:

# lib/tasks/rspec.rake
RSpec::Core::RakeTask.module_eval do
  def pattern
    extras = []
    Dir[File.join( File.expand_path( 'vendor' ), 'nsweb', '*' )].flatten.each do |dir|
      if File.directory?( dir )
        extras += File.join( dir, 'spec', '**', '*_spec.rb' ).to_s
      end
    end
    [@pattern] | extras
  end
end

Now, if I run

# rake spec

the specs from my engines will be run as well.

For autotest, I added this:

# .autotest

Autotest.add_hook :initialize do |autotest|
  autotest.add_mapping( %r%^vendor/nsweb/(.*)/app/controllers/(.*)\.rb$% ) do |_, m|
    ["vendor/nsweb/#{m[1]}/spec/controllers/#{m[2]}_spec.rb"]
  end

  autotest.add_mapping( %r%^vendor/nsweb/(.*)/app/models/(.*)\.rb$% ) do |_, m|
    ["vendor/nsweb/#{m[1]}/spec/models/#{m[2]}_spec.rb"]
  end

  autotest.add_mapping( %r%^vendor/nsweb/(.*)/lib/(.*)\.rb$% ) do |_, m|
    ["vendor/nsweb/#{m[1]}/spec/lib/#{m[2]}_spec.rb"]
  end
end

There is probably a much more elegant way to do both of these things, but this worked for me.