To cite package ‘testit’ in publications use:

  Xie Y (2024). _testit: A Simple Package for Testing R Packages_. R
  package version 0.13.1, <https://github.com/yihui/testit>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {testit: A Simple Package for Testing R Packages},
    author = {Yihui Xie},
    year = {2024},
    note = {R package version 0.13.1},
    url = {https://github.com/yihui/testit},
  }