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Tod.configure do |config|
  config.repo = TasksRepository::ActiveRecord
end

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class TasksRepository::ActiveRecord
  def persist(task_entity)
    task = Task.create({ title: task_entity.title })
    serialize task
  end

  def count
    Task.count
  end

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module Tod
  module TasksRepository
    class InMemory
      def initialize
        @tasks = {}
        @id = 0
      end

      def persist(task)
        @id += 1

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module Tod
  module Entities
    class Task
      attr_accessor :id
      attr_reader :title

      def initialize(title: '')
        @title = title
      end

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module Tod
  module UseCases
    class AddTask
      def self.add(title)
        task = Entities::Task.new(title: title)

        if task.valid?
          Tod.repo.persist(task)
        else
          false

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module Tod
  class << self
    attr_accessor :repo

    def configure
      yield self
    end

    def repo
      @repo ||= TasksRepository::InMemory.new

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require 'spec_helper'

describe Tod do
  describe '.add_task' do
    let(:repo) { Tod.repo }

    it 'adds a new task' do
      expect { Tod.add_task('speak @ Guru-SP') }.
					to change{ repo.count }.by(1)
    end

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Tod.add_task('write about clean architecture')