Resolve test/unit load ordering by removing backtrace filter from boot initializers

railties/lib/generators/rails/app/templates/test/test_helper.rb

 ENV["RAILS_ENV"] = "test"
-require 'test/unit'
-require File.expand_path(File.dirname(__FILE__) + "/../config/environment")
+require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'
 
 class ActiveSupport::TestCase

railties/lib/rails/test_help.rb

@@ -5,6 +5,12 @@
 require 'test/unit'
 require 'active_support/core_ext/kernel/requires'
 
+# TODO: Figure out how to get the Rails::BacktraceFilter into minitest/unit
+if defined?(Test::Unit::Util::BacktraceFilter) && ENV['BACKTRACE'].nil?
+  require 'rails/backtrace_cleaner'
+  Test::Unit::Util::BacktraceFilter.module_eval { include Rails::BacktraceFilterForTestUnit }
+end
+
 if defined?(ActiveRecord)
   class ActiveSupport::TestCase
     include ActiveRecord::TestFixtures

railties/lib/rails/test_unit/railtie.rb

@@ -13,13 +13,5 @@ class TestUnitRailtie < Rails::Railtie
     rake_tasks do
       load "rails/test_unit/testing.rake"
     end
-
-    initializer "test_unit.backtrace_cleaner" do
-      # TODO: Figure out how to get the Rails::BacktraceFilter into minitest/unit
-      if defined?(Test::Unit::Util::BacktraceFilter) && ENV['BACKTRACE'].nil?
-        require 'rails/backtrace_cleaner'
-        Test::Unit::Util::BacktraceFilter.module_eval { include Rails::BacktraceFilterForTestUnit }
-      end
-    end
   end
-end
\ No newline at end of file
+end