find_closest_spec_helper.rb

def find_spec_helper(path)
  spec_helper = File.join(path, 'spec_helper.rb')
  if File.exists?(spec_helper)
    spec_helper
  elsif path == "/" 
    raise "No spec helper found"
  else
    find_spec_helper(File.dirname(path))
  end 
end

root = '/Users/henrik/Sites/auktion/spec/models/auction'
puts find_spec_helper(root)