Preload Rails component gems in railties tests

railties/test/application/configuration_test.rb

@@ -314,6 +314,7 @@ def noop_email;end
     end
 
     test "the application can be eager loaded even when there are no frameworks" do
+      FileUtils.rm_rf("#{app_path}/app/jobs/application_job.rb")
       FileUtils.rm_rf("#{app_path}/app/models/application_record.rb")
       FileUtils.rm_rf("#{app_path}/app/mailers/application_mailer.rb")
       FileUtils.rm_rf("#{app_path}/config/environments")

railties/test/application/generators_test.rb

@@ -174,6 +174,7 @@ def with_bare_config
 
     test "ARGV is mutated as expected" do
       require "#{app_path}/config/environment"
+      require "rails/command"
       Rails::Command.const_set("APP_PATH", "rails/all")
 
       FileUtils.cd(rails_root) do

railties/test/application/initializers/frameworks_test.rb

@@ -211,7 +211,7 @@ def show
     test "database middleware doesn't initialize when activerecord is not in frameworks" do
       use_frameworks []
       require "#{app_path}/config/environment"
-      assert_nil defined?(ActiveRecord::Base)
+      assert !defined?(ActiveRecord::Base) || ActiveRecord.autoload?(:Base)
     end
 
     test "use schema cache dump" do

railties/test/isolation/abstract_unit.rb

@@ -299,7 +299,7 @@ def controller(name, contents)
     end
 
     def use_frameworks(arr)
-      to_remove = [:actionmailer, :activerecord] - arr
+      to_remove = [:actionmailer, :activerecord, :activestorage, :activejob] - arr
 
       if to_remove.include?(:activerecord)
         remove_from_config "config.active_record.*"
@@ -329,4 +329,22 @@ class ActiveSupport::TestCase
   File.open("#{app_template_path}/config/boot.rb", "w") do |f|
     f.puts "require 'rails/all'"
   end
+
+  # Fake 'Bundler.require' -- we run using the repo's Gemfile, not an
+  # app-specific one: we don't want to require every gem that lists.
+  contents = File.read("#{app_template_path}/config/application.rb")
+  contents.sub!(/^Bundler\.require.*/, "%w(turbolinks).each { |r| require r }")
+  File.write("#{app_template_path}/config/application.rb", contents)
+
+  require "rails"
+
+  require "active_model"
+  require "active_job"
+  require "active_record"
+  require "action_controller"
+  require "action_mailer"
+  require "action_view"
+  require "active_storage"
+  require "action_cable"
+  require "sprockets"
 end unless defined?(RAILS_ISOLATED_ENGINE)