C-geo-tests is a project mainly written in Java, it's free.
Test cases for c:geo opensource
This repository contains test cases and data for c:geo.
c:geo is simple yet powerful unofficial geocaching client for Android devices. In contrast with other similar applications, c:geo doesn't require web browser nor exports. You can just go geocaching with your phone and without any home preparation or worries. Of course, you can go without paying - it's free.
In July 2011 original author Radovan Paska aka carnero put the code as opensource licence.