Explicitly require AS::Deprecation for the SecretKeyGenerator. Bring in ActiveSupport::TestCase for its tests.

railties/lib/rails_generator/secret_key_generator.rb

@@ -1,3 +1,5 @@
+require 'active_support/deprecation'
+
 module Rails
   # A class for creating random secret keys. This class will do its best to create a
   # random secret key that's as secure as possible, using whatever methods are

railties/test/secret_key_generation_test.rb

@@ -1,4 +1,4 @@
-require 'test/unit'
+require 'abstract_unit'
 
 # Must set before requiring generator libs.
 if defined?(RAILS_ROOT)