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Document how to temporarily suppress parallel testing #2171

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Aug 4, 2025
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Document how to temporarily suppress parallel testing #2171

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2 changes: 2 additions & 0 deletions vignettes/parallel.Rmd
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Expand Up @@ -26,6 +26,8 @@ Then add the following line to the `DESCRIPTION`:
Config/testthat/parallel: true
```

If needed (for example, for debugging) you can temporarily suppress parallel testing with `Sys.setenv(TESTTHAT_PARALLEL = "false")`.

By default, testthat will use `getOption("Ncpus", 2)` cores.
To increase that value for your development machine we recommend setting `TESTTHAT_CPUS` in your `.Renviron`.
The easiest way to do that is call `usethis::edit_r_environ()` and then add something like the following:
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