load the testthat library

UBC-DSCI · Dec 7, 2024 · fab67b4 · fab67b4
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commit fab67b4
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/book/lectures/143-observability-of-code-outputs.qmd b/book/lectures/143-observability-of-code-outputs.qmd
@@ -45,6 +45,8 @@ cars_ggplot_scatter$mapping$x
 And so we could write some tests for a function that created a `ggplot2` object like so:
 
 ```{r}
+library(testthat)
+
 #' scatter2d
 #'
 #' A short-cut function for creating 2 dimensional scatterplots via ggplot2.