gistfile1.rb

def multipart_request url, env
  m = Merb::Test::MultipartRequestHelper::Post.new(env.delete(:params))
  body, head = m.to_multipart
  
  mp_env = {
    :method => 'POST',
    'CONTENT_TYPE' => head,
    'CONTENT_LENGTH' => body.length,
    :input => body
  }
  
  request url, mp_env.merge(env)
end