Add integration test in cucumber to test rake task

features/rake_tasks.feature

+Feature: Rake tasks
+
+  Background:
+    Given I generate a new rails application
+    And I run a rails generator to generate a "User" scaffold with "name:string"
+    And I run a paperclip generator to add a paperclip "attachment" to the "User" model
+    And I run a migration
+    And I add this snippet to the User model:
+      """
+      has_attached_file :attachment, :path => ":rails_root/public/system/:attachment/:style/:filename"
+      """
+
+  Scenario: Paperclip refresh thumbnails task
+    When I modify my attachment definition to:
+      """
+      has_attached_file :attachment, :path => ":rails_root/public/system/:attachment/:style/:filename",
+                                     :styles => { :medium => "200x200#" }
+      """
+    And I upload the fixture "5k.png"
+    Then the attachment "medium/5k.png" should have a dimension of 200x200
+    When I modify my attachment definition to:
+      """
+      has_attached_file :attachment, :path => ":rails_root/public/system/:attachment/:style/:filename",
+                                     :styles => { :medium => "100x100#" }
+      """
+    When I successfully run `bundle exec rake paperclip:refresh:thumbnails CLASS=User --trace`
+    Then the attachment "original/5k.png" should exist
+    And the attachment "medium/5k.png" should have a dimension of 100x100
+
+  Scenario: Paperclip refresh metadata task
+    When I upload the fixture "5k.png"
+    And I swap the attachment "original/5k.png" with the fixture "12k.png"
+    And I successfully run `bundle exec rake paperclip:refresh:metadata CLASS=User --trace`
+    Then the attachment should have the same content type as the fixture "12k.png"
+    And the attachment should have the same file size as the fixture "12k.png"
+
+  Scenario: Paperclip refresh missing styles task
+    When I upload the fixture "5k.png"
+    Then the attachment file "original/5k.png" should exist
+    And the attachment file "medium/5k.png" should not exist
+    When I modify my attachment definition to:
+      """
+      has_attached_file :attachment, :path => ":rails_root/public/system/:attachment/:style/:filename",
+                                     :styles => { :medium => "200x200#" }
+      """
+    When I successfully run `bundle exec rake paperclip:refresh:missing_styles --trace`
+    Then the attachment file "original/5k.png" should exist
+    And the attachment file "medium/5k.png" should exist
+
+  @wip
+  Scenario: Paperclip clean task
+    When I upload the fixture "5k.png"
+    And I upload the fixture "12k.png"
+    Then the attachment file "original/5k.png" should exist
+    And the attachment file "original/12k.png" should exist
+    When I modify my attachment definition to:
+      """
+      has_attached_file :attachment, :path => ":rails_root/public/system/:attachment/:style/:filename"
+      validates_attachment_size :attachment, :less_than => 10.kilobytes
+      """
+    And I successfully run `bundle exec rake paperclip:clean CLASS=User --trace`
+    Then the attachment file "original/5k.png" should exist
+    But the attachment file "original/12k.png" should not exist

features/step_definitions/attachment_steps.rb

+module AttachmentHelpers
+  def fixture_path(filename)
+    File.expand_path("#{PROJECT_ROOT}/test/fixtures/#{filename}")
+  end
+
+  def attachment_path(filename)
+    File.expand_path("public/system/attachments/#{filename}")
+  end
+end
+World(AttachmentHelpers)
+
+When /^I modify my attachment definition to:$/ do |definition|
+  in_current_dir do
+    File.open("app/models/user.rb", "w") do |file|
+      file.write <<-FILE
+        class User < ActiveRecord::Base
+          #{definition}
+        end
+      FILE
+    end
+  end
+end
+
+When /^I upload the fixture "([^"]*)"$/ do |filename|
+  in_current_dir do
+    run_simple %(bundle exec rails runner "User.create!(:attachment => File.open('#{fixture_path(filename)}'))")
+  end
+end
+
+Then /^the attachment "([^"]*)" should have a dimension of (\d+x\d+)$/ do |filename, dimension|
+  in_current_dir do
+    geometry = `identify -format "%wx%h" "#{attachment_path(filename)}"`.strip
+    geometry.should == dimension
+  end
+end
+
+Then /^the attachment "([^"]*)" should exist$/ do |filename|
+  in_current_dir do
+    File.exists?(attachment_path(filename)).should be
+  end
+end
+
+When /^I swap the attachment "([^"]*)" with the fixture "([^"]*)"$/ do |attachment_filename, fixture_filename|
+  in_current_dir do
+    require 'fileutils'
+    FileUtils.rm_f attachment_path(attachment_filename)
+    FileUtils.cp fixture_path(fixture_filename), attachment_path(attachment_filename)
+  end
+end
+
+Then /^the attachment should have the same content type as the fixture "([^"]*)"$/ do |filename|
+  in_current_dir do
+    require 'mime/types'
+    attachment_content_type = `bundle exec rails runner "puts User.last.attachment_content_type"`.strip
+    attachment_content_type.should == MIME::Types.type_for(filename).first.content_type
+  end
+end
+
+Then /^the attachment should have the same file size as the fixture "([^"]*)"$/ do |filename|
+  in_current_dir do
+    attachment_file_size = `bundle exec rails runner "puts User.last.attachment_file_size"`.strip
+    attachment_file_size.should == File.size(fixture_path(filename)).to_s
+  end
+end
+
+Then /^the attachment file "([^"]*)" should (not )?exist$/ do |filename, not_exist|
+  in_current_dir do
+    check_file_presence([attachment_path(filename)], !not_exist)
+  end
+end