tomstuart

$ cat Gemfile
source 'https://rubygems.org/'

$ time ruby -e 'puts "Hello world"'
Hello world

real	0m0.197s
user	0m0.117s
sys	0m0.073s

tomstuart

require 'rspec/core'

examples = RSpec.describe 'a "Hello world" object' do
  before(:each) do
    @hello_world = HelloWorld.new
  end

  it 'says "Hello world"' do
    raise unless @hello_world.message == 'Hello world'
  end

tomstuart

$ mkdir ~/.boot2docker
$ curl http://static.dockerfiles.io/boot2docker-v1.0.0-virtualbox-guest-additions-v4.3.12.iso > ~/.boot2docker/boot2docker.iso
$ boot2docker init
$ VBoxManage sharedfolder add boot2docker-vm -name home -hostpath /Users
$ boot2docker up
$ sudo sh -c "echo `boot2docker ip 2>/dev/null` boot2docker >> /etc/hosts"
$ echo export DOCKER_HOST=tcp://$(boot2docker ip 2>/dev/null):2375 >> .bash_profile

tomstuart

require 'active_support/time'
require 'active_support/testing/time_helpers'
require 'rspec/expectations'
include ActiveSupport::Testing::TimeHelpers
include RSpec::Matchers

class Person < Struct.new(:birthday)
  def age
    Date.today.year - birthday.year
  end

tomstuart

module ScoreHelpers
  def self.extended(base)
    base.class_eval do
      let(:scores) { {} }
    end
  end

  def the_letter(letter, options)
    score = options[:is_worth]

tomstuart

module ScoreHelpers
  def the_letter(letter, options)
    score = options[:is_worth]
    # TODO Remember the letter's score for the current example group.
  end
end

module ScoreMatchers
  extend RSpec::Matchers::DSL

tomstuart

You must already have pip (brew install python), Vagrant (from the OS X installer, not the gem) and VirtualBox installed.

First, install Docker:

$ curl https://raw.github.com/noplay/docker-osx/master/docker > /usr/local/bin/docker
$ chmod +x /usr/local/bin/docker
$ docker version

tomstuart

require 'uri'
require 'net/http'
require 'nokogiri'

uri = URI.parse('http://en.wikipedia.org/wiki/Doctor_Who')
html = Net::HTTP.get(uri)
document = Nokogiri::HTML.parse(html)

tables = document.css('table.wikitable')
table = tables.first

tomstuart

#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape         (1)1111>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape         (_)X1111>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape        1(X)1111>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape       1X(1)111>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape        1(X)X111>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape         (1)XX111>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape         (_)ZXX111>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape        1(Z)XX111>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape       1Z(X)X111>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape      1ZX(X)111>>

tomstuart

#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape         (1)1010>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape         (_)X1010>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape        1(X)1010>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape       1X(1)010>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape        1(X)X010>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape         (1)XX010>>
#<struct TMConfiguration state=:increment_counter,  tape=#<Tape         (_)ZXX010>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape        1(Z)XX010>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape       1Z(X)X010>>
#<struct TMConfiguration state=:delete_next_bit,    tape=#<Tape      1ZX(X)010>>