# File lib/fog/aws/requests/iam/list_groups_for_user.rb, line 43
        def list_groups_for_user(user_name, options = {})
          #FIXME: Does not consider options
          if data[:users].has_key? user_name
            Excon::Response.new.tap do |response|
              response.status = 200
              response.body = { 'GroupsForUser' => data[:groups].select do |name, group|
                                                     group[:members].include? user_name
                                                   end.map do |name, group|
                                                     { 'GroupId'   => group[:group_id],
                                                       'GroupName' => name,
                                                       'Path'      => group[:path],
                                                       'Arn'       => (group[:arn]).strip }
                                                   end,
                                'IsTruncated' => false,
                                'RequestId' => Fog::AWS::Mock.request_id
                              }
            end
          else
            raise Fog::AWS::IAM::NotFound.new("The user with name #{user_name} cannot be found.")
          end
        end