# File lib/fog/volume/openstack/requests/list_volume_types.rb, line 16
        def list_volume_types(_options = {})
          response = Excon::Response.new
          response.status = 200
          data[:volume_types] ||= [
            {
              "id"          => "1",
              "name"        => "type 1",
              "extra_specs" => {
                "volume_backend_name" => "type 1 backend name"
              }
            },
            {
              "id"          => "2",
              "name"        => "type 2",
              "extra_specs" => {
                "volume_backend_name" => "type 2 backend name"
              }
            }
          ]
          response.body = {'volume_types' => data[:volume_types]}
          response
        end