Reorganize autoloads:

  * A new module (ActiveSupport::Autoload) is provide that extends
    autoloading with new behavior.
  * All autoloads in modules that have extended ActiveSupport::Autoload
    will be eagerly required in threadsafe environments
  * Autoloads can optionally leave off the path if the path is the same
    as full_constant_name.underscore
  * It is possible to specify that a group of autoloads live under an
    additional path. For instance, all of ActionDispatch's middlewares
    are ActionDispatch::MiddlewareName, but they live under 
    "action_dispatch/middlewares/middleware_name"
  * It is possible to specify that a group of autoloads are all found
    at the same path. For instance, a number of exceptions might all
    be declared there.
  * One consequence of this is that testing-related constants are not
    autoloaded. To get the testing helpers for a given component,
    require "component_name/test_case". For instance, "action_controller/test_case".
  * test_help.rb, which is automatically required by a Rails application's
    test helper, requires the test_case.rb for all active components, so
    this change will not be disruptive in existing or new applications.

1 files changed, 6 insertions, 0 deletions

diff --git a/railties/lib/rails/test_help.rb b/railties/lib/rails/test_help.rb
index 9f6c42945f..0bf5f5c625 100644
--- a/railties/lib/rails/test_help.rb
+++ b/railties/lib/rails/test_help.rb
@@ -8,8 +8,14 @@ gem "rack-test", "~> 0.5.0"
 
 require 'test/unit'
 require 'active_support/core_ext/kernel/requires'
+
+# AP is always present
+require 'action_controller/test_case'
 require 'action_view/test_case'
+require 'action_dispatch/test_case'
+
 require 'action_mailer/test_case' if defined?(ActionMailer)
+require 'active_model/test_case'  if defined?(ActiveModel)
 
 if defined?(ActiveRecord)
   require 'active_record/test_case'