elissonmichael

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.

elissonmichael

describe 'Expectation Matchers' do

  describe 'equivalence matchers' do

    it 'will match loose equality with #eq' do
      a = "2 cats"
      b = "2 cats"
      expect(a).to eq(b)
      expect(a).to be == b      # synonym for #eq

elissonmichael

# Sample reference code for doubles/mocks, stubs, and spies in RSpec
# Taken from Kevin Skoglund's RSpec tutorial on Lynda.com

describe 'Doubles' do

  it "allows stubbing methods" do
    dbl = double("Chant")
    allow(dbl).to receive(:hey!)
    expect(dbl).to respond_to(:hey!)
  end

elissonmichael

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