Jekyll plugin for creating CSV files

I recently created a gem for Jekyll plugin to create some CSV files. I put a little more effort into it and tried to make it something that others might be able to use. I'm a little lost on how to test a Jekyll gem and don't often use Jekyll. I want to make the code less fragile and could use some feedback on how to do that.

Github for the gem

Configuration example on _config.yml to make it work:

serve-json-csv:
  - destination: "foldername"
    origin: "_path_from_root/to_your_data.yml"
    csv: true
    json: true
    headers: [name, description, link_url, code_url, type, categories, status]
    filter-json: true

The code:

require 'yaml'
require 'csv'
require 'json'

module Jekyll

class ConvertYamlToCsvJson < Generator

    safe true

    def generate(site)
        files_to_generate = YAML.load_file(File.join(site.source, '_config.yml'))
        files_to_generate['serve-json-csv'].each do |options| 
            yml_file = YAML.load_file(File.join(site.source, options['origin']))
            headers = options['headers']
            path_to_destination = File.join(site.source, options['destination'] + '/index')
            if options['csv']  == true 
                convert_yaml_to_csv(yml_file, path_to_destination, headers)
            end
            if options['json'] == true 
                convert_yaml_to_json(yml_file, path_to_destination, headers, options['filter-json'])
            end
        end
    end

    def convert_yaml_to_csv(yml_file, path_to_destination, headers)
        CSV.open(path_to_destination + '.csv', "wb") do |csv|
          csv << headers
          yml_file.each do |data|
            row = []
            headers.each { |header| data[header] ? row << data[header] : row << nil }
            csv << row
          end
        end
    end 

    def convert_yaml_to_json(yml_file, path_to_destination, headers, filter_options )
        File.open(path_to_destination + '.json', 'wb') do |json|
            if filter_options == true
                yml_file = yml_file.collect do |entry| 
                            entry.select{ |key, value| headers.include? key  }
                         end
            end
            json << JSON.dump(yml_file)
        end
    end 
end
end