https://github.com/KamilLelonek/Ansible-Ruby-DirectoryStatus/blob/master/library/status

status.rb

#!/usr/bin/env ruby
# WANT_JSON

require 'rubygems'
require 'json'

File.open(ARGV[0]) do |arguments_stream|
  begin
    data      = JSON.parse(arguments_stream.read)
    dir_path  = data.fetch 'dir_path'
    exists    = File.exists?(dir_path)
    directory = exists    ? File.directory?(dir_path)   : false
    empty     = directory ? Dir["#{dir_path}/*"].empty? : nil

    result = {
      exists:    exists,
      directory: directory,
      empty:     empty
    }

    print JSON.dump(result)
  rescue JSON::ParserError
    print JSON.dump({
                      failed: true,
                      msg:    'failed to parse dir_path argument'
                    })
  rescue KeyError
    print JSON.dump({
                      failed: true,
                      msg:    'dir_path key not found'
                    })
  end
end

You could use ARGF instead of File.open(ARGV[0]), it's simpler and allows reading in from STDIN.

I am not clear about, how you verify this? As in how did you use this module in a playbook?
Also, can you run an ad-hoc command using this module?