    # File lib/merb-core/test/helpers/multipart_request_helper.rb, line 165
      def multipart_fake_request(env = {}, params = {})
        if params.empty?
          fake_request(env)
        else
          m = Post.new(params)
          body, head = m.to_multipart
          fake_request(env.merge( :content_type => head,
                                  :content_length => body.length), :post_body => body)
        end
      end