Added shoulda macros

shoulda_macros/paperclip.rb

+module Paperclip
+  module Shoulda
+    def should_have_attached_file name, options = {}
+      klass = self.name.gsub(/Test$/, '').constantize
+      context "Class #{klass.name} with attachment #{name}" do
+        should "respond to all the right methods" do
+          ["#{name}_file_name", name, "#{name}?"].each do |meth|
+            assert_responds_to object, meth, "#{klass.name} does not respond to #{name}."
+          end
+        end
+
+        should "have the correct definition" do
+          expected = options
+          actual   = klass.attachment_definition[name]
+          expected.delete(:validations) unless options.key?(:validations)
+          expected.delete(:whiny_thumbnails) unless options.key?(:whiny_thumbnails)
+
+          assert_equal expected, actual
+        end
+
+        should "ensure that ImageMagick is available" do
+          %w( convert identify ).each do |command|
+            `#{Paperclip.path_for_command(command)}`
+            assert_equal 0, $?, "ImageMagick's #{command} returned with an error. Make sure that #{command} is available at #{Paperclip.path_for_command(command)}"
+          end
+        end
+      end
+    end
+  end
+end
+
+Test::Unit::TestCase.extend(Paperclip::Shoulda)