2 files changed, 32 insertions, 4 deletions
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index 11cabb2c0b..462a4d8dea 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -81,7 +81,6 @@ module TestHelpers
     def build_app(options = {})
       FileUtils.rm_rf(app_path)
       FileUtils.cp_r(tmp_path('app_template'), app_path)
-      FileUtils.ln_s(RAILS_FRAMEWORK_ROOT, app_path('vendor/rails'))
 
       # Delete the initializers unless requested
       unless options[:initializers]
@@ -93,6 +92,12 @@ module TestHelpers
       add_to_config 'config.action_controller.session = { :key => "_myapp_session", :secret => "bac838a849c1d5c4de2e6a50af826079" }'
     end
 
+    def script(script)
+      Dir.chdir(app_path) do
+        `#{Gem.ruby} #{app_path}/script/#{script}`
+      end
+    end
+
     def add_to_config(str)
       environment = File.read("#{app_path}/config/application.rb")
       if environment =~ /(\n\s*end\s*)\Z/
@@ -149,8 +154,12 @@ Module.new do
   if File.exist?(tmp_path)
     FileUtils.rm_rf(tmp_path)
   end
-
   FileUtils.mkdir(tmp_path)
-  root = File.expand_path('../../../..', __FILE__)
-  `#{Gem.ruby} -r #{root}/vendor/gems/environment #{RAILS_FRAMEWORK_ROOT}/railties/bin/rails #{tmp_path('app_template')}`
+
+  environment = File.expand_path('../../../../vendor/gems/environment', __FILE__)
+
+  `#{Gem.ruby} -r #{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}' ; require 'rails'"
+  end
 end
diff --git a/railties/test/plugins/vendored_test.rb b/railties/test/plugins/vendored_test.rb
new file mode 100644
index 0000000000..71de542ff7
--- /dev/null
+++ b/railties/test/plugins/vendored_test.rb
@@ -0,0 +1,19 @@
+require "isolation/abstract_unit"
+
+module ApplicationTests
+  class PluginTest < Test::Unit::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      build_app
+    end
+
+    test "generates the plugin" do
+      script "generate plugin my_plugin"
+      File.open("#{app_path}/vendor/plugins/my_plugin/init.rb", 'w') do |f|
+        f.puts "OMG = 'hello'"
+      end
+      require "#{app_path}/config/environment"
+    end
+  end
+end
+\ No newline at end of file