Stripe Payment Gateway Test (Minitest)

paying_customer_test.rb

require 'test_helper'

describe PayingCustomer do
  describe "without valid stripe_customer_id" do
		it "saves the user and creates the Stripe Customer" do
			user = MiniTest::Mock.new
			customer = PayingCustomer.new(user)
			user.expect(:save, true)
			def customer.gateway
				@gateway ||= MiniTest::Mock.new
			end
			customer.gateway.expect(:create, nil)
			customer.save
			assert user.verify
			assert customer.gateway.verify
		end
	end
end

Next piece of the refactor should probably be:

PayingCustomer.new(user, gateway)

Where we inject the gateway, but default to StripeGateway (or whatever) so we don't have to do the ugly "stubbing" thing in the middle.

This makes me think that stubbing is useful, but could point toward a problem with your design?