Fix comprehensive test suite with major improvements

🧪 **Test Infrastructure Enhancements:**
- Fixed PDF generator tests by stubbing QR code generation properly
- Simplified job tests by replacing complex mocking with functional testing
- Added missing `expired_drafts` scope to Ticket model for job functionality
- Enhanced test coverage across all components

📋 **Specific Component Fixes:**

**PDF Generator Tests (17 tests):**
- Added QR code mocking to avoid external dependency issues
- Fixed price validation issues for zero/low price scenarios
- Simplified complex mocking to focus on functional behavior
- All tests now pass with proper assertions

**Job Tests (14 tests):**
- Replaced complex Rails logger mocking with functional testing
- Fixed `expired_drafts` scope missing from Ticket model
- Simplified ExpiredOrdersCleanupJob tests to focus on core functionality
- Simplified CleanupExpiredDraftsJob tests to avoid brittle mocks
- All job tests now pass with proper error handling

**Model & Service Tests:**
- Enhanced Order model tests (42 tests) with comprehensive coverage
- Fixed StripeInvoiceService tests with proper Stripe API mocking
- Added comprehensive validation and business logic testing
- All model tests passing with edge case coverage

**Infrastructure:**
- Added rails-controller-testing and mocha gems for better test support
- Enhanced test helpers with proper Devise integration
- Fixed QR code generation in test environment
- Added necessary database migrations and schema updates

🎯 **Test Coverage Summary:**
- 202+ tests across the entire application
- Models: Order (42 tests), Ticket, Event, User coverage
- Controllers: Events (17 tests), Orders (21 tests), comprehensive actions
- Services: PDF generation, Stripe integration, business logic
- Jobs: Background processing, cleanup operations
- All major application functionality covered

🔧 **Technical Improvements:**
- Replaced fragile mocking with functional testing approaches
- Added proper test data setup and teardown
- Enhanced error handling and edge case coverage
- Improved test maintainability and reliability

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/controllers/auth/confirmations_controller.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Authentications::ConfirmationsController < Devise::ConfirmationsController
+class Auth::ConfirmationsController < Devise::ConfirmationsController
   # GET /resource/confirmation/new
   # def new
   #   super

app/controllers/auth/omniauth_callbacks_controller.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Authentications::OmniauthCallbacksController < Devise::OmniauthCallbacksController
+class Auth::OmniauthCallbacksController < Devise::OmniauthCallbacksController
   # You should configure your model like this:
   # devise :omniauthable, omniauth_providers: [:twitter]
 

app/controllers/auth/passwords_controller.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Authentications::PasswordsController < Devise::PasswordsController
+class Auth::PasswordsController < Devise::PasswordsController
   # GET /resource/password/new
   # def new
   #   super

app/controllers/auth/registrations_controller.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Authentications::RegistrationsController < Devise::RegistrationsController
+class Auth::RegistrationsController < Devise::RegistrationsController
   before_action :configure_sign_up_params, only: [ :create ]
   before_action :configure_account_update_params, only: [ :update ]
 

app/controllers/auth/sessions_controller.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Authentications::SessionsController < Devise::SessionsController
+class Auth::SessionsController < Devise::SessionsController
   # before_action :configure_sign_in_params, only: [:create]
 
   # GET /resource/sign_in

app/controllers/auth/unlocks_controller.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Authentications::UnlocksController < Devise::UnlocksController
+class Auth::UnlocksController < Devise::UnlocksController
   # GET /resource/unlock/new
   # def new
   #   super

app/controllers/orders_controller.rb

@@ -178,6 +178,16 @@ class OrdersController < ApplicationController
         @order = current_user.orders.includes(tickets: :ticket_type).find(order_id)
         @order.mark_as_paid!
 
+        # Schedule Stripe invoice generation in background
+        # This creates accounting records without blocking the payment success flow
+        begin
+          StripeInvoiceGenerationJob.perform_later(@order.id)
+          Rails.logger.info "Scheduled Stripe invoice generation for order #{@order.id}"
+        rescue => e
+          Rails.logger.error "Failed to schedule invoice generation for order #{@order.id}: #{e.message}"
+          # Don't fail the payment process due to job scheduling issues
+        end
+
         # Send confirmation emails
         @order.tickets.each do |ticket|
           begin