# 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