/usr/lib/R/site-library/testthat/CITATION is in r-cran-testthat 2.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | citHeader("To cite the testthat package in publications, use:")
citEntry(
  entry = "Article",
  author = personList(as.person("Hadley Wickham")),
  title = "testthat: Get Started with Testing",
  journal = "The R Journal",
  year = 2011,
  volume = 3,
  pages = "5--10",
  url = "https://journal.r-project.org/archive/2011-1/RJournal_2011-1_Wickham.pdf",
  textVersion = paste(
    "Hadley Wickham. testthat: Get Started with Testing.",
    "The R Journal, vol. 3, no. 1, pp. 5--10, 2011"
  )
)
citFooter("As testthat is continually evolving, you may want to cite its version number. Find it with 'help(package=testthat)'.")
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