Require action mailer more gracefully

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4944 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/test/controller/assert_select_test.rb

@@ -5,9 +5,18 @@
 
 require File.dirname(__FILE__) + '/../abstract_unit'
 require File.dirname(__FILE__) + '/fake_controllers'
-require "action_mailer"
 
 
+unless defined?(ActionMailer)
+  begin
+    $:.unshift(File.dirname(__FILE__) + "/../../../actionmailer/lib")
+    require 'active_mailer'
+  rescue LoadError
+    require 'rubygems'
+    require_gem 'actionmailer'
+  end
+end
+
 class AssertSelectTest < Test::Unit::TestCase
   class AssertSelectController < ActionController::Base
     def response_with=(content)