# File lib/fog/aws/requests/compute/describe_volumes_modifications.rb, line 43
        def describe_volumes_modifications(filters = {})
          response = Excon::Response.new

          modification_set = self.data[:volume_modifications].values

          aliases = {
            'volume-id'            => 'volumeId',
            'modification-state'   => 'modificationState',
            'target-size'          => 'targetSize',
            'target-iops'          => 'targetIops',
            'target-volume-type'   => 'targetVolumeType',
            'original-size'        => 'originalSize',
            'original-iops'        => 'originalIops',
            'original-volume-type' => 'originalVolumeType',
            'start-time'           => 'startTime'
          }

          attribute_aliases = {
            'targetSize'       => 'size',
            'targetVolumeType' => 'volumeType',
            'targetIops'       => 'iops'
          }

          for filter_key, filter_value in filters
            aliased_key = aliases[filter_key]
            modification_set = modification_set.reject { |m| ![*filter_value].include?(m[aliased_key]) }
          end

          modification_set.each do |modification|
            case modification['modificationState']
            when 'modifying'
              volume = self.data[:volumes][modification['volumeId']]
              modification['modificationState'] = 'optimizing'
              %w(targetSize targetIops targetVolumeType).each do |attribute|
                aliased_attribute = attribute_aliases[attribute]
                volume[aliased_attribute] = modification[attribute] if modification[attribute]
              end
              self.data[:volumes][modification['volumeId']] = volume
            when 'optimizing'
              modification['modificationState'] = 'completed'
              modification['endTime']           = Time.now
            end
          end

          response.body = {'requestId' => Fog::AWS::Mock.request_id, 'volumeModificationSet' => modification_set}
          response
        end