Rspec mocks error: wrong number of arguments

Question

I'm trying to stub out the Stripe API using Rspec and I'm running into an issue. Here's what my code looks like:

Stripe::Customer.should_receive(:create).with(any_args).and_raise(Stripe::CardError)

Here's the error I'm getting:

Failure/Error: Stripe::Customer.should_receive(:create).with(any_args).and_raise(Stripe::CardError)
ArgumentError:
  wrong number of arguments (0 for 3..6)

Answer 1

Stripe::CardError requires 3..6 arguments, per the following source code:

class CardError < StripeError
  ...
  def initialize(message, param, code, http_status=nil, http_body=nil, json_body=nil)

Here's the key documentation from the RSpec doc at github:

expect(double).to receive(:msg).and_raise(error)
  #error can be an instantiated object or a class
  #if it is a class, it must be instantiable with no args

Since you're just providing the class and the class requires arguments, it's failing. You need to instantiate it (i.e. via new) and provide arguments.

Full definition is in https://github.com/stripe/stripe-ruby/blob/0c281891948a793e79cc997d31918ba7f987f7ae/lib/stripe/errors/card_error.rb