Noob (mock/stub) ActiveMerchant

Testing RSpec
1

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/ActiveMerchant/Billing/CreditCard.html

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!

2

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

 :verification_value => card_verification,

http://activemerchant.rubyforge.org/classes/ActiveMerchant/Billing/CreditCard.html

 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.