Gemfile

require 'lotus-router'
require 'lotus-controller'

class EpisodesController
  class Show
    include Lotus::Action

    def call(params)
      p 'episodes#show'
    end
  end

  class DownloadInfo
    include Lotus::Action

    def call(params)
      p 'episodes#download_info'
    end
  end
end

router = Lotus::Router.new
router.resources 'episodes', only: [:show] do
  collection do
    get 'download_info'
  end
end

app = Rack::MockRequest.new(router)
app.get 'episodes/1'
app.get 'episodes/download_info'

router_test.rb

require 'lotus-router'
require 'lotus-controller'

class EpisodesController
  class Show
    include Lotus::Action

    def call(params)
      p 'episodes#show'
    end
  end

  class DownloadInfo
    include Lotus::Action

    def call(params)
      p 'episodes#download_info'
    end
  end
end

router = Lotus::Router.new
router.resources 'episodes', only: [:show] do
  collection do
    get 'download_info'
  end
end

app = Rack::MockRequest.new(router)
app.get 'episodes/1'
app.get 'episodes/download_info'