Improve test app creation

- Remove unneeded libraries

Also fixes an issue when running specs against Rails 5.2 / Ruby 2.2
because of a squiggly heredoc in active storage

Rakefile

@@ -16,7 +16,7 @@ namespace :testapp do
     FileUtils.mkdir_p('tmp/aruba')
     Dir.chdir('tmp') do
       FileUtils.rm_rf('railsapp')
-      sh 'rails new railsapp --skip-bundle --skip-javascript --skip-webpack-install --skip-git'
+      sh 'rails new railsapp --skip-bundle --skip-javascript --skip-active-storage --skip-active-job --skip-action-text --skip-action-cable --skip-webpack-install --skip-git'
     end
     FileUtils.cp_r('spec/fixtures/railsapp/.', 'tmp/railsapp/')
     FileUtils.rm('tmp/railsapp/Gemfile')

spec/fixtures/railsapp/config/application.rb

@@ -1,17 +1,22 @@
 require_relative 'boot'
 
-require 'rails/all'
+require "rails"
+# Pick the frameworks you want:
+require "active_model/railtie"
+# require "active_job/railtie"
+require "active_record/railtie"
+# require "active_storage/engine"
+require "action_controller/railtie"
+# require "action_mailer/railtie"
+require "action_view/railtie"
+# require "action_cable/engine"
+require "sprockets/railtie"
+# require "rails/test_unit/railtie"
 
-# Require the gems listed in Gemfile, including any gems
-# you've limited to :test, :development, or :production.
 Bundler.require(*Rails.groups)
 
 module Railsapp
   class Application < Rails::Application
-    # Initialize configuration defaults for originally generated Rails version.
     config.active_record.schema_format = :sql
-    # Settings in config/environments/* take precedence over those specified here.
-    # Application configuration should go into files in config/initializers
-    # -- all .rb files in that directory are automatically loaded.
   end
 end

spec/fixtures/railsapp/config/environments/development.rb

@@ -12,9 +12,6 @@
   # Show full error reports.
   config.consider_all_requests_local = true
 
-  # Don't care if the mailer can't send.
-  config.action_mailer.raise_delivery_errors = false
-
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log