https://masalmon.eu/tags/testthat/ Recent content in testthat on Maëlle Salmon's personal website Hugo -- gohugo.io en-us Licence: <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC BY-SA</a> Tue, 24 Sep 2024 00:00:00 +0000 https://masalmon.eu/2024/09/24/cover-modify-r-packages/ Tue, 24 Sep 2024 00:00:00 +0000 https://masalmon.eu/2024/09/24/cover-modify-r-packages/ I&rsquo;ve recently been dealing with legacy code refactoring both in theory and in practice: while I&rsquo;m continuing some work on the igraph R package, I&rsquo;ve started reading Working Effectively with Legacy Code by Michael Feathers, that had been in my to-read pile for months. In this post, I&rsquo;ll summarize some ideas from both the book and my work. &ldquo;Cover and modify&rdquo; with &ldquo;characterization tests&rdquo; When you start modifying your rusty code, how do you ensure you do not break existing and important behaviour inadvertently?