diff --git a/actionmailer/test/abstract_unit.rb b/actionmailer/test/abstract_unit.rb
index f6baa4a9e8..9d3c9086c9 100644
--- a/actionmailer/test/abstract_unit.rb
+++ b/actionmailer/test/abstract_unit.rb
@@ -1,4 +1,7 @@
-require File.expand_path('../../../load_paths', __FILE__)
+require File.expand_path('../../../bundler', __FILE__)
+
+lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
 
 require 'test/unit'
 require 'action_mailer'
@@ -14,7 +17,7 @@ ActionView::Template.register_template_handler :bak, lambda { |template| "Lame b
 FIXTURE_LOAD_PATH = File.expand_path('fixtures', File.dirname(__FILE__))
 ActionMailer::Base.view_paths = FIXTURE_LOAD_PATH
 
-class MockSMTP  
+class MockSMTP
   def self.deliveries
     @@deliveries
   end
diff --git a/actionmailer/test/subscriber_test.rb b/actionmailer/test/subscriber_test.rb
index 3d1736d64f..88a5d2ca34 100644
--- a/actionmailer/test/subscriber_test.rb
+++ b/actionmailer/test/subscriber_test.rb
@@ -1,3 +1,6 @@
+railties_path = File.expand_path('../../../railties/lib', __FILE__)
+$:.unshift(railties_path) if File.directory?(railties_path) && !$:.include?(railties_path)
+
 require "abstract_unit"
 require "rails/subscriber/test_helper"
 require "action_mailer/railties/subscriber"
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index 867e50d5b9..655a133c96 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -1,4 +1,10 @@
-require File.expand_path('../../../load_paths', __FILE__)
+require File.expand_path('../../../bundler', __FILE__)
+
+lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+
+activemodel_path = File.expand_path('../../../activemodel/lib', __FILE__)
+$:.unshift(activemodel_path) if File.directory?(activemodel_path) && !$:.include?(activemodel_path)
 
 $:.unshift(File.dirname(__FILE__) + '/lib')
 $:.unshift(File.dirname(__FILE__) + '/fixtures/helpers')
diff --git a/actionpack/test/activerecord/controller_runtime_test.rb b/actionpack/test/activerecord/controller_runtime_test.rb
index ed8e324938..f044e714d8 100644
--- a/actionpack/test/activerecord/controller_runtime_test.rb
+++ b/actionpack/test/activerecord/controller_runtime_test.rb
@@ -1,3 +1,6 @@
+railties_path = File.expand_path('../../../../railties/lib', __FILE__)
+$:.unshift(railties_path) if File.directory?(railties_path) && !$:.include?(railties_path)
+
 require 'active_record_unit'
 require 'active_record/railties/controller_runtime'
 require 'fixtures/project'
@@ -12,7 +15,7 @@ class ControllerRuntimeSubscriberTest < ActionController::TestCase
       render :inline => "<%= Project.all %>"
     end
   end
-  
+
   include Rails::Subscriber::TestHelper
   tests SubscriberController
 
@@ -31,7 +34,7 @@ class ControllerRuntimeSubscriberTest < ActionController::TestCase
   def set_logger(logger)
     ActionController::Base.logger = logger
   end
- 
+
   def test_log_with_active_record
     get :show
     wait
@@ -39,4 +42,4 @@ class ControllerRuntimeSubscriberTest < ActionController::TestCase
     assert_equal 2, @logger.logged(:info).size
     assert_match /\(Views: [\d\.]+ms | ActiveRecord: [\d\.]+ms\)/, @logger.logged(:info)[1]
   end
-end
\ No newline at end of file
+end
diff --git a/actionpack/test/controller/subscriber_test.rb b/actionpack/test/controller/subscriber_test.rb
index d7c1166f14..72368df93b 100644
--- a/actionpack/test/controller/subscriber_test.rb
+++ b/actionpack/test/controller/subscriber_test.rb
@@ -1,3 +1,6 @@
+railties_path = File.expand_path('../../../../railties/lib', __FILE__)
+$:.unshift(railties_path) if File.directory?(railties_path) && !$:.include?(railties_path)
+
 require "abstract_unit"
 require "rails/subscriber/test_helper"
 require "action_controller/railties/subscriber"
diff --git a/actionpack/test/template/subscriber_test.rb b/actionpack/test/template/subscriber_test.rb
index 8bacab7088..8470f3c931 100644
--- a/actionpack/test/template/subscriber_test.rb
+++ b/actionpack/test/template/subscriber_test.rb
@@ -1,3 +1,6 @@
+railties_path = File.expand_path('../../../../railties/lib', __FILE__)
+$:.unshift(railties_path) if File.directory?(railties_path) && !$:.include?(railties_path)
+
 require "abstract_unit"
 require "rails/subscriber/test_helper"
 require "action_view/railties/subscriber"
@@ -90,4 +93,4 @@ class AVSubscriberTest < ActiveSupport::TestCase
     assert_equal 1, @logger.logged(:info).size
     assert_match /Rendered collection/, @logger.logged(:info).last
   end
-end
\ No newline at end of file
+end
diff --git a/activemodel/Rakefile b/activemodel/Rakefile
index 14c02f183f..556ea2ec0b 100755
--- a/activemodel/Rakefile
+++ b/activemodel/Rakefile
@@ -13,7 +13,7 @@ require 'rake/testtask'
 task :default => :test
 
 Rake::TestTask.new do |t|
-  t.libs << "#{dir}/test"
+  t.libs << "test"
   t.test_files = Dir.glob("#{dir}/test/cases/**/*_test.rb").sort
   t.warning = true
 end
diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index 8bcbe54651..8b1ab9e196 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -1,4 +1,9 @@
-require File.expand_path('../../../../load_paths', __FILE__)
+require File.expand_path('../../../../bundler', __FILE__)
+
+lib = File.expand_path("#{File.dirname(__FILE__)}/../../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+
+puts $LOAD_PATH.inspect
 
 require 'config'
 require 'active_model'
diff --git a/activemodel/test/cases/tests_database.rb b/activemodel/test/cases/tests_database.rb
index 8ca54d2678..4a392f609f 100644
--- a/activemodel/test/cases/tests_database.rb
+++ b/activemodel/test/cases/tests_database.rb
@@ -1,6 +1,8 @@
 require 'logger'
 
-$:.unshift(File.dirname(__FILE__) + '/../../../activerecord/lib')
+activerecord_path = File.expand_path('../../../../activerecord/lib', __FILE__)
+$:.unshift(activerecord_path) if File.directory?(activerecord_path) && !$:.include?(activerecord_path)
+
 require 'active_record'
 
 module ActiveModel
diff --git a/activerecord/lib/active_record.rb b/activerecord/lib/active_record.rb
index b79da4565d..99ff0a19a5 100644
--- a/activerecord/lib/active_record.rb
+++ b/activerecord/lib/active_record.rb
@@ -21,7 +21,6 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #++
 
-
 activesupport_path = File.expand_path('../../../activesupport/lib', __FILE__)
 $:.unshift(activesupport_path) if File.directory?(activesupport_path) && !$:.include?(activesupport_path)
 
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 9e8bfbbee8..3254e7d800 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -1,4 +1,7 @@
-require File.expand_path('../../../../load_paths', __FILE__)
+require File.expand_path('../../../../bundler', __FILE__)
+
+lib = File.expand_path("#{File.dirname(__FILE__)}/../../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
 
 require 'config'
 
diff --git a/activerecord/test/cases/subscriber_test.rb b/activerecord/test/cases/subscriber_test.rb
index 5328d4468b..3d7a8f5bab 100644
--- a/activerecord/test/cases/subscriber_test.rb
+++ b/activerecord/test/cases/subscriber_test.rb
@@ -1,3 +1,6 @@
+railties_path = File.expand_path('../../../../railties/lib', __FILE__)
+$:.unshift(railties_path) if File.directory?(railties_path) && !$:.include?(railties_path)
+
 require "cases/helper"
 require "models/developer"
 require "rails/subscriber/test_helper"
@@ -39,4 +42,4 @@ class SubscriberTest < ActiveSupport::TestCase
     assert_match /CACHE/, @logger.logged(:debug).last
     assert_match /SELECT .*?FROM .?developers.?/, @logger.logged(:debug).last
   end
-end
\ No newline at end of file
+end
diff --git a/activeresource/test/abstract_unit.rb b/activeresource/test/abstract_unit.rb
index 1af535e811..1c6f92cba4 100644
--- a/activeresource/test/abstract_unit.rb
+++ b/activeresource/test/abstract_unit.rb
@@ -1,4 +1,7 @@
-require File.expand_path('../../../load_paths', __FILE__)
+require File.expand_path('../../../bundler', __FILE__)
+
+lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
 
 require 'rubygems'
 require 'test/unit'
@@ -6,7 +9,6 @@ require 'active_resource'
 require 'active_support'
 require 'active_support/test_case'
 
-$:.unshift "#{File.dirname(__FILE__)}/../test"
 require 'setter_trap'
 
 require 'logger'
diff --git a/activeresource/test/cases/subscriber_test.rb b/activeresource/test/cases/subscriber_test.rb
index fb890e86cb..c673a0551a 100644
--- a/activeresource/test/cases/subscriber_test.rb
+++ b/activeresource/test/cases/subscriber_test.rb
@@ -1,9 +1,13 @@
+railties_path = File.expand_path('../../../../railties/lib', __FILE__)
+$:.unshift(railties_path) if File.directory?(railties_path) && !$:.include?(railties_path)
+
 require "abstract_unit"
 require "fixtures/person"
 require "rails/subscriber/test_helper"
 require "active_resource/railties/subscriber"
 require "active_support/core_ext/hash/conversions"
 
+# TODO: This test should be part of Railties
 class SubscriberTest < ActiveSupport::TestCase
   include Rails::Subscriber::TestHelper
   Rails::Subscriber.add(:active_resource, ActiveResource::Railties::Subscriber.new)
@@ -28,4 +32,4 @@ class SubscriberTest < ActiveSupport::TestCase
     assert_equal "GET http://37s.sunrise.i:3000/people/1.xml", @logger.logged(:info)[0]
     assert_match /\-\-\> 200 200 106/, @logger.logged(:info)[1]
   end
-end
\ No newline at end of file
+end
diff --git a/activesupport/test/abstract_unit.rb b/activesupport/test/abstract_unit.rb
index 33be6f65bf..c4ef102bf0 100644
--- a/activesupport/test/abstract_unit.rb
+++ b/activesupport/test/abstract_unit.rb
@@ -1,4 +1,7 @@
-require File.expand_path('../../../load_paths', __FILE__)
+require File.expand_path('../../../bundler', __FILE__)
+
+lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
 
 require 'test/unit'
 require 'mocha'
diff --git a/bundler.rb b/bundler.rb
new file mode 100644
index 0000000000..dcc8ed61f1
--- /dev/null
+++ b/bundler.rb
@@ -0,0 +1,10 @@
+begin
+  require File.expand_path('../.bundle/environment', __FILE__)
+rescue LoadError
+  begin
+    require 'rubygems'
+    require 'bundler'
+    Bundler.setup
+  rescue LoadError
+  end
+end
diff --git a/load_paths.rb b/load_paths.rb
deleted file mode 100644
index d5f2ca0734..0000000000
--- a/load_paths.rb
+++ /dev/null
@@ -1,21 +0,0 @@
-begin
-  require File.expand_path('../.bundle/environment', __FILE__)
-rescue LoadError
-  begin
-    require 'rubygems'
-    require 'bundler'
-    Bundler.setup
-  rescue LoadError
-    %w(
-      actionmailer
-      actionpack
-      activemodel
-      activerecord
-      activeresource
-      activesupport
-      railties
-    ).each do |framework|
-      $:.unshift File.expand_path("../#{framework}/lib", __FILE__)
-    end
-  end
-end
diff --git a/railties/Rakefile b/railties/Rakefile
index f32a794544..d4b446bc24 100644
--- a/railties/Rakefile
+++ b/railties/Rakefile
@@ -1,4 +1,4 @@
-require File.expand_path('../../load_paths', __FILE__)
+require File.expand_path('../../bundler', __FILE__)
 
 require 'rake'
 require 'rake/testtask'
diff --git a/railties/test/abstract_unit.rb b/railties/test/abstract_unit.rb
index aa66dbb9be..2ac165fc49 100644
--- a/railties/test/abstract_unit.rb
+++ b/railties/test/abstract_unit.rb
@@ -1,8 +1,13 @@
 ORIG_ARGV = ARGV.dup
 
-require File.expand_path("../../../load_paths", __FILE__)
+require File.expand_path("../../../bundler", __FILE__)
 $:.unshift File.expand_path("../../builtin/rails_info", __FILE__)
 
+lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+
+require 'edge_rails'
+
 require 'stringio'
 require 'test/unit'
 require 'fileutils'
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index 56f45582c8..7ca605ec23 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -140,7 +140,7 @@ module ApplicationTests
         require "#{app_path}/config/environment"
       end
     end
-    
+
     test "filter_parameters should be able to set via config.filter_parameters" do
       add_to_config <<-RUBY
         config.filter_parameters += [ :foo, 'bar', lambda { |key, value|
diff --git a/railties/test/edge_rails.rb b/railties/test/edge_rails.rb
new file mode 100644
index 0000000000..bd8a674738
--- /dev/null
+++ b/railties/test/edge_rails.rb
@@ -0,0 +1,14 @@
+require File.expand_path('../../../bundler', __FILE__)
+
+%w(
+  actionmailer
+  actionpack
+  activemodel
+  activerecord
+  activeresource
+  activesupport
+  railties
+).each do |framework|
+  framework_path = File.expand_path("../../../#{framework}/lib", __FILE__)
+  $:.unshift(framework_path) if File.directory?(framework_path) && !$:.include?(framework_path)
+end
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index 364dbd8e55..f3c1d64f7b 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -187,7 +187,7 @@ module TestHelpers
     end
 
     def boot_rails
-      require File.expand_path('../../../../load_paths', __FILE__)
+      require File.expand_path('../../edge_rails', __FILE__)
     end
   end
 end
@@ -208,18 +208,12 @@ Module.new do
   end
   FileUtils.mkdir(tmp_path)
 
-  environment = File.expand_path('../../../../load_paths', __FILE__)
-  if File.exist?("#{environment}.rb")
-    require_environment = "-r #{environment}"
-  end
+  environment = File.expand_path('../../edge_rails', __FILE__)
+  require_environment = "-r #{environment}"
 
   `#{Gem.ruby} #{require_environment} #{RAILS_FRAMEWORK_ROOT}/railties/bin/rails #{tmp_path('app_template')}`
   File.open("#{tmp_path}/app_template/config/boot.rb", 'w') do |f|
-    if require_environment
-      f.puts "Dir.chdir('#{File.dirname(environment)}') do"
-      f.puts "  require '#{environment}'"
-      f.puts "end"
-    end
+    f.puts "require '#{environment}'"
     f.puts "require 'rails/all'"
   end
 end