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AGILE ESTIMATING AND PLANNING

Mike Cohn

CHAPTER 1. The Purpose of Planning

Plans help to guide investment decisions (this project is worth to begin?), know who needs to be available to work on a project during a given period and know if a project is on track.

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Commit Message Guidelines

Short (72 chars or less) summary

More detailed explanatory text. Wrap it to 72 characters. The blank
line separating the summary from the body is critical (unless you omit
the body entirely).

Write your commit message in the imperative: "Fix bug" and not "Fixed
bug" or "Fixes bug." This convention matches up with commit messages

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MiniTest::Spec

use must for positive expectations and wont for negative expectations.

• must_be | list.size.must_be :zero?
• must_be_close_to | subject.size.must_be_close_to 1,1
• must_be_empty | list.must_be_empty
• must_be_instance_of | list.must_be_instance_of Array
• must_be_kind_of | list.must_be_kind_of Enumerable

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# encoding: utf-8
# Be sure to restart your server when you modify this file.

# Add new inflection rules using the following format
# (all these examples are active by default):
# ActiveSupport::Inflector.inflections do |inflect|
#   inflect.plural /^(ox)$/i, '\1en'
#   inflect.singular /^(ox)en/i, '\1'
#   inflect.irregular 'person', 'people'
#   inflect.uncountable %w( fish sheep )

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HTTP status code symbols for Rails

Thanks to Cody Fauser for this list of HTTP responce codes and their Ruby on Rails symbol mappings.

Status Code Symbol
1xx Informational
100 :continue
101 :switching_protocols
102 :processing

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Chapter 1 - Object Oriented Design

The purpose of design is to allow you to do design later, and it's primary goal is to reduce the cost of change.

SOLID Design:

• Single Responsibility Principle: a class should have only a single responsibility
• Open-Closed Principle: Software entities should be open for extension, but closed for modification (inherit instead of modifying existing classes).
• Liskov Substitution: Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
• Interface Segregation: Many client-specific interfaces are better than one general-purpose interface.

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require 'minitest/mock'
require 'minitest/unit'
require 'date'

MiniTest::Unit.autorun

class TestMailPurge < MiniTest::Unit::TestCase
  class MailPurge
    def initialize(imap)
      @imap = imap

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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'.source.ruby':
  'describe (String)':
    'prefix': 'des'
    'body': 'describe "${1:subject}" do\n  $0\nend'
  'describe (type)':
    'prefix': 'dest'
    'body': 'describe ${1:Type} do\n  $0\nend'
  'describe (type, string)':
    'prefix': 'dests'
    'body': 'describe ${1:Type}, "${2:description}" do\n  $0\nend'

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class Carrinho
  attr_reader :pedidos
  def initialize(args)
    @pedido_class = args[:pedido_class]
    @pedidos      = []
  end

  def adicionar(produto)
    @pedidos << @pedido_class.new(produto)
  end