autotest with specs in a normal ruby library

Put this in a '.autotest' file in your project's base directory:

# -*- ruby -*-

# in .autotest file:

Autotest.add_hook :initialize do |at|
  at.clear_mappings
end

Autotest.add_hook :initialize do |at|
  at.add_mapping(%r%^lib/(.*)\.rb$%) { |_, m|
    ["spec/#{m[1]}_spec.rb"]
    ## for both specs and tests:
    #["spec/#{m[1]}_spec.rb","test/#{m[1]}_test.rb"]
  }
end