Unisons,

If you don’t want traffic from organic search and you are sure the pages haven’t been indexed yet, you can certainly add them to robots.txt for exclusion.

As for your duplicate content questions, there should not be any implications in your testing phase. Search engines don’t necessarily penalize sites for having duplicate content. The problem with duplicate content is that having substantially large blocks of text on the same or across domains confuses search engines. They don’t know which page to index so often they either only index one or ignore both. This indirectly penalizes a website because a webmaster may want both of those pages indexed or they may have inadvertently made duplicate content (for instance a printer friendly version of a page). So in a nutshell I wouldn’t worry about it.

More on duplicate content,

Duplicate content - Webmaster Tools Help

Hope that helps,

Shawn

Emm... If both the pages have similar content, I would advise to hide one of the from search engine bots. On the other hand, it is observed that duplicate content inside a website won’t hurt your website or lead to penalty. So... if you want both of them to get indexed, let them index. Because there are so many legitimate reasons for having similar content on more than one page of a website.

Hi Unisons,

There is no need to worry about it, just don't include the test page in your navigation links and you will be fine. Spiders crawl links, if there are no links then they will not crawl it.