This testsuite is quite obviously a work in progress. As such, there are a number of good extensions. If you are looking for something to do, feel free to tackle one or more of the following: Buildroot support Erik has put together a handy package for constructing and testing busybox called buildroot. Integrating this into the testsuite would allow for greater test coverage (e.g., init, mount, and other privileged applications). libbb unit testing Being able to test the functions of libbb individually may help to prevent regressions. Standardization This testsuite is totally bastardized. It would be better to use an existing test framework, such as dejagnu, greg, or a XUnit clone (shunit?).