Autotest.add_hook :initialize do |at|
  at.add_exception %r%^\./(?:tasks|resources)%
  at.clear_mappings

  at.add_mapping(%r(lib/.*\.rb$)) do |filename, _|
    test_filename = filename.gsub(/^lib/, 'test').gsub(/\.rb$/, '_test.rb')
    at.files_matching %r{^#{test_filename}$}
  end

  at.add_mapping %r{^test/test_helper.rb$} do |filename, _|
    at.files_matching %r{test/.*_test\.rb$}
  end

  at.add_mapping %r{^test/.*\.rb$} do |filename, _|
    filename
  end
end