engine = new DRLParserEngine(rule);
info = (DRLRuleRefactorInfo) engine.parse();
RuleBasicContentInfo content = info.getContentAt(87);
RenameAssistantOption assistantOption = new RenameAssistantOption("rename variable", "message", content, 87);
AssistantOption result = VariableRename.execute(assistantOption, "msg");
assertTrue(result.getContent().contains("m : Message( $status : status == Message.HELLO, msg :message )"));
assertTrue(result.getContent().contains("System.out.println( msg );"));