RSpec Examples

rspec_examples.rb

#run me with `rspec -fd --color rspec_examples.rb` 
require 'rspec'

# The class we want to test
class YoMama 

  attr_accessor :makeup

  def fat?() true ; end
  
  def wearing?(what)
    what == 'combat boots' ? true : false
  end

  def put(something)
    @makeup = something.match(/head/) ? 'mind' : 'body'
    self
  end
  
end
    
describe YoMama do
  # Subject can be defined with a block
  # The following is actually implicit because of the describe block
  subject { YoMama.new }

  it 'needs to lose weight' do
    # Automatic matchers are written like this
    subject.should be_fat

    # This could be written badly this way
    subject.fat?.should be_true
    
    # Or this way, which is even worse
    subject.fat?.should == true
  end

  it 'dresses like a man' do
    # Automatic matchers with args
    subject.should be_wearing('combat boots')

    # should_not asserts false statements
    subject.should_not be_wearing('a bikini')
  end

  it 'is uneducated' do
    # You can define your own matchers; make your tests readable!
    subject.put('lipstick on her head').should makeup_her('mind')
      end

end

# Here is where we defined the matcher for the last example
RSpec::Matchers.define :makeup_her do |expected|
  match do |actual|
    actual.makeup == expected
  end
end