Autotest.add_hook :initialize do |at|
  at.clear_mappings
  
  # rerun all tests for any change to a lib file
  at.add_mapping(%r%^lib/(.*)\.rb$%) do |filename, match|
    at.files_matching %r%^spec/.*_spec.rb$%
  end
  at.add_mapping(/^spec.*\/.*_spec\.rb$/) do |filename, match|
    filename
  end
 
end