Fix broken test

.gitignore

@@ -0,0 +1,16 @@
+*.gem
+\#*
+*~
+.#*
+.DS_Store
+.idea
+.project
+.sass-cache
+coverage
+Gemfile.lock
+tmp
+nbproject
+pkg
+*.swp
+spec/dummy
+coverage/**/*

app/controllers/spree/mercadopago_controller.rb

@@ -12,7 +12,7 @@ def checkout
                              .create!(amount: current_order.total, payment_method: payment_method)
       payment.started_processing!
 
-      preferences = ::Mercadopago::OrderPreferencesBuilder
+      preferences = Mercadopago::Services::OrderPreferencesBuilder
                     .new(current_order, payment, callback_urls)
                     .preferences_hash
 
@@ -43,7 +43,7 @@ def ipn
                      .new(operation_id: params[:id], topic: params[:topic])
 
       if notification.save
-        Mercadopago::HandleReceivedNotification.new(notification).process!
+        Mercadopago::Services::HandleReceivedNotification.new(notification).process!
         status = :ok
       else
         status = :bad_request

app/models/mercadopago/services/handle_received_notification.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Mercadopago
+  module Services
+    class HandleReceivedNotification
+      def initialize(notification)
+        @notification = notification
+      end
+
+      # The purpose of this method is to enable async/sync processing
+      # of Mercado Pago IPNs. For simplicity processing is synchronous but
+      # if you would like to enqueue the processing via Resque/Ost/etc you
+      # will be able to do it.
+      def process!
+        # Sync
+        ::ProcessNotification.new(@notification).process!
+        # Async Will be configurable via block for example:
+        # Resque.enqueue(ProcessNotificationWorker, {id: @notification.id})
+      end
+    end
+  end
+end

app/models/mercadopago/services/process_notification.rb

@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+# Process notification:
+# ---------------------
+# Fetch collection information
+# Find payment by external reference
+# If found
+#   Update payment status
+#   Notify user
+# If not found
+#   Ignore notification (maybe payment from outside Spree)
+module Mercadopago
+  module Services
+    class ProcessNotification
+      # Equivalent payment states
+      # MP state => Spree state
+      # =======================
+      #
+      # approved     => complete
+      # pending      => pend
+      # in_process   => pend
+      # rejected     => failed
+      # refunded     => void
+      # cancelled    => void
+      # in_mediation => pend
+      # charged_back => void
+      STATES = {
+        complete: %w[approved],
+        failure: %w[rejected],
+        void:    %w[refunded cancelled charged_back]
+      }.freeze
+
+      attr_reader :notification
+
+      def initialize(notification)
+        @notification = notification
+      end
+
+      def process!
+        # Fix: Payment method is an instance of Spree::PaymentMethod::Mercadopago not THE class
+        client = ::Spree::PaymentMethod::Mercadopago.first.provider
+        raw_op_info = client.get_operation_info(notification.operation_id)
+        op_info = raw_op_info['collection'] if raw_op_info.present?
+        # TODO: rewrite this.
+        if op_info && (payment = Spree::Payment.where(number: op_info['external_reference']).first)
+          if STATES[:complete].include?(op_info['status'])
+            payment.complete
+          elsif STATES[:failure].include?(op_info['status'])
+            payment.failure
+          elsif STATES[:void].include?(op_info['status'])
+            payment.void
+          end
+
+          # When Spree issue #5246 is fixed we can remove this line
+          payment.order.updater.update
+        end
+      end
+    end
+  end
+end

app/models/spree/payment_method/mercadopago.rb

@@ -3,8 +3,8 @@
 module Spree
   class PaymentMethod::Mercadopago < PaymentMethod
     preference :sandbox, :boolean, default: true
-    preference :client_id, :string, default: ENV['Mercadopago_CLIENT_ID']
-    preference :client_secret, :string, default: ENV['Mercadopago_CLIENT_SECRET']
+    preference :client_id, :string, default: ENV['MERCADOPAGO_CLIENT_ID']
+    preference :client_secret, :string, default: ENV['MERCADOPAGO_CLIENT_SECRET']
 
     def payment_profiles_supported?
       false

spec/controllers/spree/mercado_pago_controller_spec.rb

@@ -10,7 +10,7 @@
       let(:use_case) { double('use_case') }
 
       it 'handles notification and returns success' do
-        allow(Mercadopago::HandleReceivedNotification).to receive(:new).and_return(use_case)
+        allow(Mercadopago::Services::HandleReceivedNotification).to receive(:new).and_return(use_case)
         expect(use_case).to receive(:process!)
 
         post :ipn, params: { id: operation_id, topic: 'payment', format: :json }

spec/models/mercadopago/order_preferences_builder_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe 'OrderPreferencesBuilder' do
+describe Mercadopago::OrderPreferencesBuilder do
   # Factory order_with_line_items is incredibly slow..
   let(:order) do
     order = create(:order)
@@ -20,7 +20,12 @@
   include Spree::ProductsHelper
 
   context 'Calling preferences_hash' do
-    let(:subject) { Mercadopago::OrderPreferencesBuilder.new(order, payment, callback_urls, payer_data).preferences_hash }
+    let(:subject) do
+      Mercadopago::OrderPreferencesBuilder.new(order,
+                                               payment,
+                                               callback_urls,
+                                               payer_data).preferences_hash
+    end
 
     it 'returns external reference' do
     end

spec/models/mercadopago/services/process_notification_spec.rb

@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Mercadopago::Services::ProcessNotification do
+  let(:order)   { FactoryBot.create(:completed_order_with_pending_payment) }
+  let(:payment) { order.payments.first }
+
+  let(:operation_id) { 'op123' }
+  let(:notification) do
+    Mercadopago::Notification.new(topic: 'payment', operation_id: operation_id)
+  end
+  let(:operation_info) do
+    {
+      'collection' => {
+        'external_reference' => order.payments.first.number,
+        'status' => 'approved'
+      }
+    }
+  end
+
+  describe 'with valid operation_info' do
+    # The first payment method of this kind will be picked by the process task
+    before do
+      fake_client = double('fake_client')
+      fake_payment_method = double('fake_payment_method', provider: fake_client)
+      allow(Spree::PaymentMethod::Mercadopago).to receive(:first).and_return(fake_payment_method)
+      allow(fake_client).to receive(:get_operation_info).with(operation_id)
+                                                        .and_return(operation_info)
+      # TODO: check this test
+      # payment.pend!
+      expect(payment.state).to eq('pending')
+    end
+
+    describe '#process!' do
+      it 'completes payment for approved payment' do
+        Mercadopago::Services::ProcessNotification.new(notification).process!
+        payment.reload
+        expect(payment.state).to eq('completed')
+      end
+
+      it 'fails payment for rejected payment' do
+        operation_info['collection']['status'] = 'rejected'
+        Mercadopago::Services::ProcessNotification.new(notification).process!
+        payment.reload
+        expect(payment.state).to eq('failed')
+      end
+
+      it 'voids payment for rejected payment' do
+        operation_info['collection']['status'] = 'cancelled'
+        Mercadopago::Services::ProcessNotification.new(notification).process!
+        payment.reload
+        expect(payment.state).to eq('void')
+      end
+
+      it 'pends payment for pending payment' do
+        operation_info['collection']['status'] = 'pending'
+        Mercadopago::Services::ProcessNotification.new(notification).process!
+        payment.reload
+        expect(payment.state).to eq('pending')
+      end
+    end
+  end
+
+  describe 'with invalid operation_info' do
+    # The first payment method of this kind will be picked by the process task
+    before do
+      fake_client = double('fake_client')
+      fake_payment_method = double('fake_payment_method', provider: fake_client)
+      allow(Spree::PaymentMethod::Mercadopago).to receive(:first).and_return(fake_payment_method)
+      allow(fake_client).to receive(:get_operation_info).with(operation_id)
+                                                        .and_return(nil)
+      # TODO: check this test
+      # payment.pend!
+      expect(payment.state).to eq('pending')
+    end
+
+    describe '#process!' do
+      it 'does not crash' do
+        Mercadopago::Services::ProcessNotification.new(notification).process!
+      end
+    end
+  end
+end