covr, gridExtra, ggplot2movies, forcats, knitr, tidyverse,
testthat, vdiffr, viridis
covr, dplyr, gridExtra, ggplot2movies, DAAG, forcats, knitr,
rmarkdown, testthat, vdiffr, viridis
covr, dplyr, patchwork, ggplot2movies, forcats, knitr,
rmarkdown, testthat, vdiffr