    # File lib/fog/aws/requests/iam/list_groups.rb, line 43
            def list_groups(options = {} )
              #FIXME: Doesn't observe options
              Excon::Response.new.tap do |response|
                response.status = 200
                response.body = { 'Groups' => data[:groups].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
            end