To cite package ‘piktests’ in publications use:

  Führlich P, Dietrich J (2022). _piktests: Run PIK Integration Tests_.
  R package version 0.10.2, <https://github.com/pik-piam/piktests>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {piktests: Run PIK Integration Tests},
    author = {Pascal Führlich and Jan Philipp Dietrich},
    year = {2022},
    note = {R package version 0.10.2},
    url = {https://github.com/pik-piam/piktests},
  }