Nesta has a fair number of bits and pieces that users can reasonably expect to work together. For example, themes and plugins should all work with the latest release of Nesta.
The scripts in this project are used to check out whether or not pages render successfully with different themes, under different releases of Nesta.
This project is thereofre only really of interest to people who want to make sure that Nesta is working fine with all the bits and pieces that go with it. That probably means that you're either a) a very concientious theme author, or b) me (gma).