DEPRECATION: mock is deprecated. Use double instead.

Yeah, double, mock, and stub have historically mean aliases to each other. I take them to mean:

• double: an object you want to use in place of a real object for the use of testing. Think a spy double-agent
• mock: a test-double that you intend to add a message expectation to (test a method was called on it)
• stub: literally same as double. Confusing since you stub methods out.

As far as rspec deprecating mock, I think that's booooo 👎 but it's their project.

to use it:

double(:name, methods)

so, if you wanted a user that you'll call "Mary" that has a name and email, you could:

double(:mary, {name: 'Mary Johnson', email: 'mary9425@hotmail.com'})

A possible use:

require 'rspec'


class User
  def self.deliquent_process!
    deliquent_users.each do |user|
      user.send_deliquent_notice
    end
  end
end

describe 'emails deliquent invoices' do

  let(:mary)  { double(:mary, {name: 'Mary Johnson', email: 'mary9425@hotmail.com'}) }

  it 'will email mary' do
    User.stub('deliquent_users') { [mary] }
    mary.should_receive(:send_deliquent_notice)
    User.deliquent_process!
  end
end

If you run this, it'll pass. but, it'll pass all the same if you replace the mary with:

let(:mary)  { double }

it's because it's a throwaway holder. We just care that the "thing" representing a user gets called.

help?

The code you submitted on the assignment looks great -- no improvement needed!

Ah, thanks for that explanation and the example. Very helpful!