# File lib/paperclip/matchers/validate_attachment_size_matcher.rb, line 65
        def passes_validation_with_size(new_size)
          file = StringIO.new(".")
          override_method(file, :size){ new_size }
          override_method(file, :to_tempfile){ file }

          @subject.send(@attachment_name).assign(file)
          @subject.valid?
          @subject.errors["#{@attachment_name}_file_size""#{@attachment_name}_file_size"].blank?
        end