track stripe errors in Datadog so we can alert on them (#5797)

app/controllers/stripe_active_cards_controller.rb

@@ -11,9 +11,14 @@ class StripeActiveCardsController < ApplicationController
         "Your billing information has been updated"
     else
       logger.info("Stripe Add New Card Failure - #{current_user.username}")
+      DataDogStatsClient.increment("stripe.errors")
       redirect_to "/settings/billing", flash: { error:
         "There was a problem updating your billing info." }
     end
+  rescue Stripe::InvalidRequestError
+    DataDogStatsClient.increment("stripe.errors")
+    redirect_to "/settings/billing", flash: { error:
+        "There was a problem updating your billing info." }
   end
 
   def update
@@ -31,6 +36,7 @@ class StripeActiveCardsController < ApplicationController
         "There was a problem updating your billing info." }
     end
   rescue Stripe::CardError => e
+    DataDogStatsClient.increment("stripe.errors")
     flash[:error] = e.message
     redirect_to "/settings/billing"
   end

spec/requests/stripe_active_cards_spec.rb

@@ -26,6 +26,27 @@ RSpec.describe "StripeSubscriptions", type: :request do
       card = Stripe::Customer.retrieve(user.stripe_id_code).sources.first
       expect(card.is_a?(Stripe::Card)).to eq(true)
     end
+
+    it "increments sidekiq.errors in Datadog on failure" do
+      allow(DataDogStatsClient).to receive(:increment)
+      invalid_error = Stripe::InvalidRequestError.new(nil, nil)
+      allow(Stripe::Customer).to receive(:create).and_raise(invalid_error)
+      post "/stripe_active_cards", params: { stripe_token: stripe_helper.generate_card_token }
+      expect(DataDogStatsClient).to have_received(:increment).with("stripe.errors")
+    end
+  end
+
+  describe "PUT StripeActiveCards#update" do
+    it "increments sidekiq.errors in Datadog on failure" do
+      valid_instance(user)
+      customer = Stripe::Customer.retrieve(user.stripe_id_code)
+      original_card_id = customer.sources.all(object: "card").first.id
+      allow(DataDogStatsClient).to receive(:increment)
+      card_error = Stripe::CardError.new(nil, nil, nil)
+      allow(Stripe::Customer).to receive(:retrieve).and_raise(card_error)
+      put "/stripe_active_cards/#{original_card_id}", params: {}
+      expect(DataDogStatsClient).to have_received(:increment).with("stripe.errors")
+    end
   end
 
   describe "DESTROY StripeActiveCards#destroy" do