Testing R Code

<p><em>Learn how to write R code with fewer bugs.</em></p><p></p><p>The problem with programming is that you are always one typo away from writing something silly. Likewise with data analysis a small mistake in your model can lead to a big mistake in your results. Combining the two disciplines means that it is all too easy for a missed minus sign to generate a false prediction that you don’t spot until it’s too late. Testing is the only way to be sure that your code and your results are correct.</p><p>Testing R Code teaches you how to perform development-time testing using the testthat package allowing you to ensure that your code works as intended. The book also teaches run-time testing using the assertive package; enabling your users to correctly run your code.</p><p></p><p>After beginning with an introduction to testing in R the book explores more advanced cases such as integrating tests into R packages; testing code that accesses databases; testing C++ code with Rcpp; and testing graphics. Each topic is explained with real-world examples and has accompanying exercises for readers to practise their skills — only a small amount of experience with R is needed to get started!</p>