Autotest.add_hook(:initialize) do |at|
  at.clear_mappings
  at.find_directories = %w(lib test)

  at.add_exception("test/test_helper.rb")
  at.add_exception("test/rails_test_helper.rb")

  at.add_mapping(/^lib\/.*\.rb$/) do |file, _|
    at.files_matching(/^test\/.*_test\.rb$/)
  end

  at.add_mapping(/^test\/.*_test\.rb$/) do |file, _|
    file
  end
end