CODEWITHSUNDEEP
ruby-on-railsrubyrspecrspec-rails
Piyush Chaudhary
Piyush Chaudhary

Reputation: 313

Check if a method of a class is called from the method of the different class in rspec

Let's say there are two classes:

1.

class Fax
  def initialize(number)
    **code**
  end

  def send!
    **code**
  end
end

class FaxJob
  def perform
    Fax.new(number).send!
  end
end

In the FaxJobSpec, I need to confirm that FaxJob.perform_now(number) run the Fax.new(number).send!

Upvotes: 0

Views: 1434

Answers (1)

João Fernandes
João Fernandes

Reputation: 721

You should use a double.

it 'sends fax!' do
  fax_instance = instance_double(Fax)
  allow(Fax).to(receive(:new).and_return(fax_instance))
  allow(fax_instance).to(receive(:send!))

  FaxJob.perform_now(number)

  expect(fax_instance).to(have_received(:send!))
end

You can avoid having to allow instance and class with a minor refactor to your Fax class:

class Fax
  def self.send!(number)
    new(number).send!
  end
end

FaxJob:

class FaxJob
  def perform
    Fax.send!(number)
  end
end

And then your test:

it 'sends fax!' do
  allow(Fax).to(receive(:send!).and_call_original)

  FaxJob.perform_now(number)

  expect(Fax).to(have_received(:send!).with(number))
end

If you are really into DRY, this should work too:

it 'sends fax!' do
  expect(Fax).to(receive(:send!).with(number))

  FaxJob.perform_now(number)
end

I am not really found of this latter one because it does not respect the AAA (arrange, act, assert) and it compromises readability, imo.

Upvotes: 1

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