rspec_mock_spec.rb

# Padrâo xUnit 4 fases de teste - 4 Standard test phases XUnit
# Setup
# Exercise
# Verify
# Teardown


# "Mocks são para a fase de Verify" - "Mocks are for the Verify stage" 
# "Mocks são usados para testar comportamentos" - "Mocks are used to test behaviors"

# Com mocks fica assim a ordem das fases de teste(With mock objects so is the order of the test phases):

# Setup
# Verify**
# Exercise
# Teardown

require 'student'
require 'course'

describe 'Mocks' do
  it '#bar' do
    # setup
    student = Student.new

    # verify
    expect(student).to receive(:bar)

    # exercise
    student.bar
  end

  it 'args' do
    student = Student.new
    expect(student).to receive(:foo).with(123)
    student.foo(123)
  end

  it 'repetição' do
    student = Student.new
    expect(student).to receive(:foo).with(123).twice
    student.foo(123)
    student.foo(123)
  end

  it 'retorno' do
    student = Student.new
    expect(student).to receive(:foo).with(123).and_return(true)
    puts student.foo(123)
  end
end