it-test demonstrating the change. Unit tests follow the <code>testthat</code> framework with files in <code>tests/testthat</code>. Please make sure that the testing suite passes before issuing a pull request. This can be done by running <code>check()</code> from the <code>devtools</code> package, which will also check for consistent documentation, etc.</p>
<p>This package uses the <a href="https://github.com/krlmlr/r-appveyor" class="external-link">AppVeyor</a> continuous testing mechanism for R to ensure t