Changing directories during the test breaks file loading when ran by itself

actionpack/test/abstract_unit.rb

@@ -51,6 +51,7 @@ I18n.backend.store_translations 'pt-BR', {}
 ORIGINAL_LOCALES = I18n.available_locales.map {|locale| locale.to_s }.sort
 
 FIXTURE_LOAD_PATH = File.join(File.dirname(__FILE__), 'fixtures')
+FIXTURES = Pathname.new(FIXTURE_LOAD_PATH)
 
 class ActionController::IntegrationTest < ActiveSupport::TestCase
   def self.build_app(routes = nil)

actionpack/test/controller/new_base/render_file_test.rb

@@ -1,110 +1,99 @@
 require 'abstract_unit'
 
 module RenderFile
-  
   class BasicController < ActionController::Base
-      self.view_paths = File.dirname(__FILE__)
-    
+    self.view_paths = File.dirname(__FILE__)
+
     def index
       render :file => File.join(File.dirname(__FILE__), *%w[.. .. fixtures test hello_world])
     end
-    
+
     def with_instance_variables
       @secret = 'in the sauce'
       render :file => File.join(File.dirname(__FILE__), '../../fixtures/test/render_file_with_ivar.erb')
     end
-    
+
     def without_file_key
       render File.join(File.dirname(__FILE__), *%w[.. .. fixtures test hello_world])
     end
-    
+
     def without_file_key_with_instance_variable
       @secret = 'in the sauce'
       render File.join(File.dirname(__FILE__), '../../fixtures/test/render_file_with_ivar.erb')
     end
-    
+
     def relative_path
       @secret = 'in the sauce'
       render :file => '../../fixtures/test/render_file_with_ivar'
     end
-    
+
     def relative_path_with_dot
       @secret = 'in the sauce'
       render :file => '../../fixtures/test/dot.directory/render_file_with_ivar'
     end
-    
+
     def pathname
       @secret = 'in the sauce'
       render :file => Pathname.new(File.dirname(__FILE__)).join(*%w[.. .. fixtures test dot.directory render_file_with_ivar.erb])
     end
-    
+
     def with_locals
       path = File.join(File.dirname(__FILE__), '../../fixtures/test/render_file_with_locals.erb')
       render :file => path, :locals => {:secret => 'in the sauce'}
     end
-    
+
     def without_file_key_with_locals
-      path = File.expand_path('../../fixtures/test/render_file_with_locals.erb')
+      path = FIXTURES.join('test/render_file_with_locals.erb').to_s
       render path, :locals => {:secret => 'in the sauce'}
     end
   end
-  
+
   class TestBasic < SimpleRouteCase
     testing RenderFile::BasicController
-    
-    def setup
-      @old_pwd = Dir.pwd
-      Dir.chdir(File.dirname(__FILE__))
-    end
-    
-    def teardown
-      Dir.chdir(@old_pwd)
-    end
-    
+
     test "rendering simple template" do
       get :index
       assert_response "Hello world!"
     end
-    
+
     test "rendering template with ivar" do
       get :with_instance_variables
       assert_response "The secret is in the sauce\n"
     end
-    
+
     test "rendering path without specifying the :file key" do
       get :without_file_key
       assert_response "Hello world!"
     end
-    
+
     test "rendering path without specifying the :file key with ivar" do
       get :without_file_key_with_instance_variable
       assert_response "The secret is in the sauce\n"
     end
-    
+
     test "rendering a relative path" do
       get :relative_path
       assert_response "The secret is in the sauce\n"
     end
-    
+
     test "rendering a relative path with dot" do
       get :relative_path_with_dot
       assert_response "The secret is in the sauce\n"
     end
-    
+
     test "rendering a Pathname" do
       get :pathname
       assert_response "The secret is in the sauce\n"
     end
-    
+
     test "rendering file with locals" do
       get :with_locals
       assert_response "The secret is in the sauce\n"
     end
-    
+
     test "rendering path without specifying the :file key with locals" do
       get :without_file_key_with_locals
       assert_response "The secret is in the sauce\n"
     end
   end
-  
 end