To cite package ‘testthis’ in publications use:

Fleck S (2022). testthis: Utils and 'RStudio' Addins to Make Testing Even More Fun. R package version 1.1.1.9000, https://github.com/s-fleck/testthis.

Corresponding BibTeX entry:

  @Manual{,
    title = {testthis: Utils and 'RStudio' Addins to Make Testing Even
      More Fun},
    author = {Stefan Fleck},
    year = {2022},
    note = {R package version 1.1.1.9000},
    url = {https://github.com/s-fleck/testthis},
  }