 <p>It turns out that a naïve approach is fairly easy; the following (<em>complete</em> <code>.travis.yml</code>) works for my purposes:</p> <pre><code>language: R install: - Rscript -e 'install.packages(c("devtools", "testthat"))' - Rscript -e 'devtools::install_github("klmr/modules")' script: make test </code></pre> <p>However, I’d still prefer a solution that can actually use the Travis declarations (<code>r_binary_packages</code>, etc.) instead of having to install dependencies manually.</p>