class RSpec::Core::Configuration

def configure_group(group)
  modules = {
    :include => [] + group.included_modules,
    :extend  => [] + group.ancestors
  }
  include_or_extend_modules.each do |include_or_extend, mod, filters|
    next unless group.all_apply?(filters)
    next if modules[include_or_extend].include?(mod)
    modules[include_or_extend] << mod
    group.send(include_or_extend, mod)
  end
end