Forum: RSpec Noob (mock/stub) ActiveMerchant..

Hi Group

I'm still waiting for the light to come on with stubbing/mocking and
the syntax for each. I have simple method in my Order class like
so....

 def credit_card
    ActiveMerchant::Billing::CreditCard.new(
      :type               => card_type,
      :number             => card_number,
      :verification_value => card_verification,
      :month              => card_expires_on.blank? ? Time.now.month :
card_expires_on.month,
      :year               => card_expires_on.blank? ? Time.now.year :
card_expires_on.year,
      :first_name         => first_name,
      :last_name          => last_name
    )
  end

This method should return valid if the card is valid.
http://activemerchant.rubyforge.org/classes/Active...

I started out like this but then confusion set in. If anyone has the
time to help me understand or write the proper spec for this method I
think it will help me better understand how to stub or mock a 3rd
party item like this. I just watched the peepcode screencast and I've
watched the railscasts. I'm just trying to apply my meager
understanding to my own project now.

it "should validate credit card" do
      gateway = stub('gateway')
      gateway.should_recieve(:valid)
      ActiveMerchant::Billing::CreditCard.stub(:new).and_return
gateway
    end

I also have a credit card Factory setup, but I'm not sure where or how
I apply this to the stub.

Thanks in advance!

On Oct 28, 2011, at 10:16 AM, internetchris wrote:

>      :verification_value => card_verification,
> 
http://activemerchant.rubyforge.org/classes/Active...
>      gateway.should_recieve(:valid)
>      ActiveMerchant::Billing::CreditCard.stub(:new).and_return
> gateway
>    end

This RSpec example has nothing to do with a gateway. Also, it is a 
credit card object, which does not talk to any third party service. You 
don't need to use any mocking here.

You probably want to make sure the credit_card *can* be valid. So to do 
so, you'll need to create a valid user (or whatever model this 
credit_card method is in:

describe User do
  describe '#credit_card' do
    context 'with a valid user' do
      let(:user) { create(:user) }

      it 'returns a valid credit card instance' do
        user.credit_card.should 
be_an_instance_of(ActiveMerchant::Billing::CreditCard)
        user.credit_card.should be_valid
      end
    end
  end
end

Now, your User factory would fill in all the credit card fields so the 
credit card is able to be valid. I would also check that the credit card 
has the correct attributes:

describe User do
  describe '#credit_card' do
    context 'with a valid user' do
      let(:user) { create(:user, card_type: 'Visa') }

      describe 'the returned credit card instance' do
        it 'has the correct card_type' do
          user.credit_card.card_type.should eq('Visa')
        end
      end
    end
  end
end

As far as mocking third party gateway services, ActiveMerchant provides 
built in support to switch a gateway to its "test" mode, which you would 
do in your test.rb environment. ActiveMerchant has good documentation 
for all of this.

Hope that helps.