Improve Stripe::ProfileStorer specs

* Use `with_stripe_setup` helper
* add the request failing scenario

spec/lib/stripe/profile_storer_spec.rb

@@ -5,6 +5,7 @@ require 'spec_helper'
 module Stripe
   describe ProfileStorer do
     include StripeStubs
+    include StripeHelper
 
     describe "create_customer_from_token" do
       let(:stripe_payment_method) { create(:stripe_sca_payment_method) }
@@ -18,9 +19,11 @@ module Stripe
         { status: 200, body: JSON.generate(id: customer_id, sources: { data: [{ id: "1" }] }) }
       }
 
-      before do
-        Stripe.api_key = "sk_test_12345"
+      around do |example|
+        with_stripe_setup { example.run }
+      end
 
+      before do
         stub_customers_post_request(email: payment.order.email, response: customer_response_mock)
         stub_payment_method_attach_request(payment_method: card_id, customer: customer_id)
       end
@@ -32,6 +35,18 @@ module Stripe
           expect(payment.source.gateway_customer_profile_id).to eq customer_id
           expect(payment.source.gateway_payment_profile_id).to eq card_id
         end
+
+        context "when request fails" do
+          it "raises an error" do
+            expect(stripe_payment_method.provider).to receive(:store).and_return(
+              ActiveMerchant::Billing::Response.new(false, "some error")
+            )
+
+            expect { profile_storer.create_customer_from_token }.to raise_error(
+              Spree::Core::GatewayError
+            )
+          end
+        end
       end
     end
   end