testthat 0.10.0 is now available on CRAN. Testthat makes it easy to turn the informal testing that you’re already doing into formal automated tests. Learn more at http://r-pkgs.had.co.nz/tests.html. Install the latest version with:

install.packages("testthat")

There are four big changes in this release:

There were a number of other minor improvements and bug fixes. See the release notes for a complete list.