diff --git a/Gemfile b/Gemfile
index 68f68aa22d80f..68e6487e2c0e1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,17 +1,20 @@
-gem "rake", ">= 0.8.7"
+path File.expand_path('..', __FILE__)
+source :gemcutter
+
+gem "rails", "3.0.pre"
+
+gem "rake",  ">= 0.8.7"
 gem "mocha", ">= 0.9.8"
-gem "ruby-debug", ">= 0.10.3" if RUBY_VERSION < '1.9'
 
-gem "rails", "3.0.pre", :path => "railties"
-%w(activesupport activemodel actionpack actionmailer activerecord activeresource).each do |lib|
-  gem lib, '3.0.pre', :path => lib
+if RUBY_VERSION < '1.9'
+  gem "ruby-debug", ">= 0.10.3"
 end
 
 # AR
 gem "arel", ">= 0.2.0"
 gem "sqlite3-ruby", ">= 1.2.5"
 
-only :test do
+group :test do
   gem "pg", ">= 0.8.0"
   gem "mysql", ">= 2.8.1"
 end
@@ -21,8 +24,6 @@ gem "rack-test", "0.5.3"
 gem "RedCloth", ">= 4.2.2"
 
 if ENV['CI']
-  disable_system_gems
-
   gem "nokogiri", ">= 1.4.0"
   gem "memcache-client", ">= 1.7.6"
 
@@ -34,5 +35,3 @@ if ENV['CI']
     gem "test-unit", ">= 2.0.5"
   end
 end
-
-disable_system_gems
diff --git a/actionmailer/test/abstract_unit.rb b/actionmailer/test/abstract_unit.rb
index ce09bb5d61254..8fb941f9c96d7 100644
--- a/actionmailer/test/abstract_unit.rb
+++ b/actionmailer/test/abstract_unit.rb
@@ -1,12 +1,5 @@
-begin
-  require File.expand_path('../../../vendor/gems/environment', __FILE__)
-rescue LoadError
-end
-
-lib = File.expand_path('../../lib', __FILE__)
-$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+require File.expand_path('../../../load_paths', __FILE__)
 
-require 'rubygems'
 require 'test/unit'
 require 'action_mailer'
 
diff --git a/actionpack/test/abstract_unit.rb b/actionpack/test/abstract_unit.rb
index 7b04638ccc246..867e50d5b9599 100644
--- a/actionpack/test/abstract_unit.rb
+++ b/actionpack/test/abstract_unit.rb
@@ -1,10 +1,4 @@
-begin
-  require File.expand_path('../../../vendor/gems/environment', __FILE__)
-rescue LoadError
-end
-
-lib = File.expand_path('../../lib', __FILE__)
-$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+require File.expand_path('../../../load_paths', __FILE__)
 
 $:.unshift(File.dirname(__FILE__) + '/lib')
 $:.unshift(File.dirname(__FILE__) + '/fixtures/helpers')
@@ -20,9 +14,6 @@
 require 'action_dispatch'
 require 'fixture_template'
 require 'active_support/dependencies'
-
-activemodel_path = File.expand_path('../../../activemodel/lib', __FILE__)
-$:.unshift(activemodel_path) if File.directory?(activemodel_path) && !$:.include?(activemodel_path)
 require 'active_model'
 
 begin
diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index 917bb720d0606..8bcbe546516cd 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -1,10 +1,4 @@
-begin
-  require File.expand_path('../../../../vendor/gems/environment', __FILE__)
-rescue LoadError
-end
-
-lib = File.expand_path('../../../lib', __FILE__)
-$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+require File.expand_path('../../../../load_paths', __FILE__)
 
 require 'config'
 require 'active_model'
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index fa76e2d57a652..9e8bfbbee8738 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -1,14 +1,7 @@
-begin
-  require File.expand_path('../../../../vendor/gems/environment', __FILE__)
-rescue LoadError
-end
-
-lib = File.expand_path('../../../lib', __FILE__)
-$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+require File.expand_path('../../../../load_paths', __FILE__)
 
 require 'config'
 
-require 'rubygems'
 require 'test/unit'
 require 'stringio'
 
diff --git a/activeresource/test/abstract_unit.rb b/activeresource/test/abstract_unit.rb
index 1e71d5d0dd355..2f43916521fba 100644
--- a/activeresource/test/abstract_unit.rb
+++ b/activeresource/test/abstract_unit.rb
@@ -1,10 +1,4 @@
-begin
-  require File.expand_path('../../../vendor/gems/environment', __FILE__)
-rescue LoadError
-end
-
-lib = File.expand_path('../../lib', __FILE__)
-$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+require File.expand_path('../../../load_paths', __FILE__)
 
 require 'rubygems'
 require 'test/unit'
diff --git a/activesupport/test/abstract_unit.rb b/activesupport/test/abstract_unit.rb
index d91e0415c4773..33be6f65bfe80 100644
--- a/activesupport/test/abstract_unit.rb
+++ b/activesupport/test/abstract_unit.rb
@@ -1,12 +1,4 @@
-ORIG_ARGV = ARGV.dup
-
-begin
-  require File.expand_path('../../../vendor/gems/environment', __FILE__)
-rescue LoadError
-end
-
-lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
-$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+require File.expand_path('../../../load_paths', __FILE__)
 
 require 'test/unit'
 require 'mocha'
diff --git a/load_paths.rb b/load_paths.rb
new file mode 100644
index 0000000000000..55e2a530bd8f1
--- /dev/null
+++ b/load_paths.rb
@@ -0,0 +1,21 @@
+begin
+  require File.expand_path('../vendor/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
\ No newline at end of file
diff --git a/railties/Rakefile b/railties/Rakefile
index b8f5e81b85045..ea0b8ef8fb982 100644
--- a/railties/Rakefile
+++ b/railties/Rakefile
@@ -1,7 +1,4 @@
-begin
-  require File.expand_path('../../vendor/gems/environment', __FILE__)
-rescue LoadError
-end
+require File.expand_path('../../load_paths', __FILE__)
 
 require 'rake'
 require 'rake/testtask'
diff --git a/railties/test/abstract_unit.rb b/railties/test/abstract_unit.rb
index 77ef82856a57a..aa66dbb9be217 100644
--- a/railties/test/abstract_unit.rb
+++ b/railties/test/abstract_unit.rb
@@ -1,15 +1,7 @@
 ORIG_ARGV = ARGV.dup
 
-root = File.expand_path('../../..', __FILE__)
-begin
-  require "#{root}/vendor/gems/environment"
-rescue LoadError
-  %w(activesupport activemodel activerecord actionpack actionmailer activeresource railties).each do |lib|
-    $:.unshift "#{root}/#{lib}/lib"
-  end
-end
-
-$:.unshift "#{root}/railties/builtin/rails_info"
+require File.expand_path("../../../load_paths", __FILE__)
+$:.unshift File.expand_path("../../builtin/rails_info", __FILE__)
 
 require 'stringio'
 require 'test/unit'
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index 940585836c006..ff4ee6332bf4e 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -183,23 +183,7 @@ def use_frameworks(arr)
     end
 
     def boot_rails
-      root = File.expand_path('../../../..', __FILE__)
-      begin
-        require "#{root}/vendor/gems/environment"
-      rescue LoadError
-        %w(
-          actionmailer/lib
-          actionpack/lib
-          activemodel/lib
-          activerecord/lib
-          activeresource/lib
-          activesupport/lib
-          railties/lib
-          railties
-        ).reverse_each do |path|
-          $:.unshift "#{root}/#{path}"
-        end
-      end
+      require File.expand_path('../../../../load_paths', __FILE__)
     end
   end
 end
@@ -220,14 +204,18 @@ class Test::Unit::TestCase
   end
   FileUtils.mkdir(tmp_path)
 
-  environment = File.expand_path('../../../../vendor/gems/environment', __FILE__)
+  environment = File.expand_path('../../../../load_paths', __FILE__)
   if File.exist?("#{environment}.rb")
     require_environment = "-r #{environment}"
   end
 
   `#{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|
-    f.puts "require '#{environment}'" if require_environment
+    if require_environment
+      f.puts "Dir.chdir('#{File.dirname(environment)}') do"
+      f.puts "  require '#{environment}'"
+      f.puts "end"
+    end
     f.puts "require 'rails/all'"
   end
 end