Added a rake task for testing all versions. Changed gem statements to use ~>…

Added a rake task for testing all versions. Changed gem statements to use ~> instead of hard versions.

Rakefile

@@ -8,6 +8,11 @@ require 'paperclip'
 desc 'Default: run unit tests.'
 task :default => [:clean, :test]
 
+desc 'Test the paperclip plugin under all supported Rails versions.'
+task :all_versions do |t|
+  exec('rake RAILS_VERSION=2.1 && rake RAILS_VERSION=2.3 && rake RAILS_VERSION=3.0')
+end
+
 desc 'Test the paperclip plugin.'
 Rake::TestTask.new(:test) do |t|
   t.libs << 'lib' << 'profile'

test/helper.rb

@@ -7,34 +7,26 @@ require 'mocha'
 
 case ENV['RAILS_VERSION']
 when '2.1' then
-  puts "Using Rails 2.1.2"
-  gem 'activerecord',  '2.1.2'
-  gem 'activesupport', '2.1.2'
-  gem 'actionpack',    '2.1.2'
-
-  require 'activerecord'
-  require 'activesupport'
-  require 'actionpack'
+  gem 'activerecord',  '~>2.1.0'
+  gem 'activesupport', '~>2.1.0'
+  gem 'actionpack',    '~>2.1.0'
 when '3.0' then
-  puts "Using Rails 3.0.0.beta3"
-  gem 'activerecord',  '3.0.0.beta3'
-  gem 'activesupport', '3.0.0.beta3'
-  gem 'actionpack',    '3.0.0.beta3'
-
-  require 'active_record'
-  require 'active_support'
-  require 'action_pack'
+  gem 'activerecord',  '~>3.0.0'
+  gem 'activesupport', '~>3.0.0'
+  gem 'actionpack',    '~>3.0.0'
 else
-  puts "Using Rails 2.3.5"
-  gem 'activerecord',  '2.3.5'
-  gem 'activesupport', '2.3.5'
-  gem 'actionpack',    '2.3.5'
-
-  require 'active_record'
-  require 'active_support'
-  require 'action_pack'
+  gem 'activerecord',  '~>2.3.0'
+  gem 'activesupport', '~>2.3.0'
+  gem 'actionpack',    '~>2.3.0'
 end
 
+require 'active_record'
+require 'active_record/version'
+require 'active_support'
+require 'action_pack'
+
+puts "Testing againt version #{ActiveRecord::VERSION::STRING}"
+
 begin
   require 'ruby-debug'
 rescue LoadError => e