console.rb

class Console
  def render_help!
    puts "available commands: "
    puts "list" 
    puts "add <description>" 
    puts "delete <id>"
    puts "tick <id>" 
    puts "untick <id>"
  end

  def render_all!(tasks)
    puts "your list"
    puts tasks
  end

  def task_successfully_added!(task)
    puts "task: '#{task.description}' was added to the DB!"
  end

  def task_not_added!
    puts "error: task must have a description"
  end
end

notes

docs
  google: relish rspec 
    - check the version at the top of the page
      - rspec 2.x is very different from rspec 3.x

installation + config
  spec_helper: this is a file that lives in your ./spec folder, anything that all your tests need, put here.

spec organization:
  describe
    - used to organize tests about the same thing
  context
    - used to organize tests about the same thing, but in a different context
  it
    - actual tests

expectations:
  relish-rspec expectations (3.x)
    - expect(<actual>).to <matcher>(<expected>)

cute tricks to refactor our tests:
  before
    - the contents of a before block run before every test in a describe
  after
    - the contents of an after block run after every test in a describe  
  let
    - generates something when we talk about it 
      - that something is cached within tests
      - not cached across tests
  let!
    - generates something before every test

spec_helper.rb

require 'rubygems'
require File.expand_path("../../config/application", __FILE__)

task.rb

class Task < ActiveRecord::Base
  validates :description, presence: true

  def to_s
    "[#{marker}] #{id}. #{description}"
  end

  def marker
    completed ? "X" : " "
  end
end

task_spec.rb

require 'spec_helper'

describe "Task" do
  let(:incomplete_task) { Task.create(description: "meow") }
  let(:complete_task) { Task.create(description: "meow", completed: true) }

  before do
    Task.destroy_all
  end

  describe "#to_s" do
    it "prints the task in a pretty way" do
      expect(incomplete_task.to_s).to eq("[ ] #{incomplete_task.id}. #{incomplete_task.description}")
    end
  end

  describe "#marker" do
    context "if completed" do
      it "returns 'X'" do
        expect(complete_task.marker).to eq("X")
      end
    end

    context "if incompleted" do
      it "returns ' '" do
        expect(incomplete_task.marker).to eq(" ")
      end
    end
  end
end

tasks_controller.rb

require_relative '../../config/application.rb'
require_relative '../../app/views/console.rb'

class TasksController
	def initialize
		@console = Console.new
	end

  def print_list!
    tasks = Task.all
    @console.render_all!(tasks)
  end

  def add_to_list!(description)
    task = Task.new(description: description)
    if task.save
      @console.task_successfully_added!(task)
    else 
      @console.task_not_added!
    end
  end

  def help!
    @console.render_help!
  end
end

tasks_controller_spec.rb

require 'spec_helper'
require_relative './../app/controllers/tasks_controller.rb'

describe "TasksController" do
  let(:tasks_controller) { TasksController.new }

  before do
    Task.destroy_all
  end

  describe "#add_to_list!(description)" do
    context "if description" do
      it "adds new task with specified description to the DB" do
        tasks_controller.add_to_list!("meow")
        expect(Task.find_by_description("meow")).to be_truthy
      end
    end

    context "if no description" do
      it "task not added to the DB" do
        tasks_controller.add_to_list!("")
        expect(Task.all.length).to eq(0)
      end
    end
  end 
end

todo.rb

require_relative 'config/application'
require_relative 'app/controllers/tasks_controller.rb'

user_input = ARGV
command = user_input.shift
params = user_input.join(" ")

tasks_controller = TasksController.new

case command
	when "list" then tasks_controller.print_list!
 	when "add" then tasks_controller.add_to_list!(params)
 	else tasks_controller.help!
end